fix: added fetch env config to imitate the ee repo functionality (#29266)

## Description
- Added the fetching of environment config for ee repo on create new app
onboarding flow.
- Imitated the `fetchingEnvironmentConfigs` function from ee to ce to
provide consistency on both repos
- Avoid the redirection from datasource sagas for changing the
datasource form which was throwing error trying to create a redirection
url.

#### PR fixes following issue(s)
Fixes #29231 
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about this first
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#### Type of change
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- Bug fix (non-breaking change which fixes an issue)
- New feature (non-breaking change which adds functionality)
- Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- Chore (housekeeping or task changes that don't impact user perception)
- This change requires a documentation update
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## Testing
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#### How Has This Been Tested?
> Please describe the tests that you ran to verify your changes. Also
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- [ ] Manual
- [ ] JUnit
- [ ] Jest
- [ ] Cypress
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#### Test Plan
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#### Issues raised during DP testing
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## Checklist:
#### Dev activity
- [ ] My code follows the style guidelines of this project
- [ ] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] PR is being merged under a feature flag


#### QA activity:
- [ ] [Speedbreak
features](https://github.com/appsmithorg/TestSmith/wiki/Guidelines-for-test-plans#speedbreakers-)
have been covered
- [ ] Test plan covers all impacted features and [areas of
interest](https://github.com/appsmithorg/TestSmith/wiki/Guidelines-for-test-plans#areas-of-interest-)
- [ ] Test plan has been peer reviewed by project stakeholders and other
QA members
- [ ] Manually tested functionality on DP
- [ ] We had an implementation alignment call with stakeholders post QA
Round 2
- [ ] Cypress test cases have been added and approved by SDET/manual QA
- [ ] Added `Test Plan Approved` label after Cypress tests were reviewed
- [ ] Added `Test Plan Approved` label after JUnit tests were reviewed


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

- **New Features**
- Implemented a new action to fetch environment configurations,
enhancing the app's data management capabilities.
- Updated application creation flow to automatically fetch environment
configurations when a workspace ID is present.

- **Enhancements**
- Improved the logic for redirecting users in the data source creation
process to be more context-aware.

- **Bug Fixes**
- Addressed an issue where users were being redirected incorrectly
during the data source creation process.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

app/client/src/ce/actions/environmentAction.ts

@@ -6,3 +6,12 @@ export const setCurrentEditingEnvironmentID = (currentEditingId: string) => ({
   type: "",
   payload: { currentEditingId },
 });
+
+// Redux action to fetch environments
+export const fetchingEnvironmentConfigs = (
+  workspaceId: string,
+  fetchDatasourceMeta = false,
+) => ({
+  type: "",
+  payload: { workspaceId, fetchDatasourceMeta },
+});

app/client/src/ce/pages/Applications/CreateNewAppsOption.tsx

@@ -61,6 +61,7 @@ import { TEMP_DATASOURCE_ID } from "constants/Datasource";
 import { fetchMockDatasources } from "actions/datasourceActions";
 import DatasourceForm from "pages/Editor/SaaSEditor/DatasourceForm";
 import type { Datasource } from "entities/Datasource";
+import { fetchingEnvironmentConfigs } from "@appsmith/actions/environmentAction";
 
 const SectionWrapper = styled.div`
   display: flex;
@@ -242,6 +243,9 @@ const CreateNewAppsOption = ({
       if (isEnabledForStartWithData) {
         dispatch(fetchPlugins());
         dispatch(fetchMockDatasources());
+        if (application?.workspaceId) {
+          dispatch(fetchingEnvironmentConfigs(application?.workspaceId, true));
+        }
         setUseType(START_WITH_TYPE.DATA);
       }
     } else {

app/client/src/sagas/DatasourcesSagas.ts

@@ -1157,6 +1157,9 @@ function* changeDatasourceSaga(
   const { datasource, shouldNotRedirect } = actionPayload.payload;
   const { id } = datasource;
   const draft: Record<string, unknown> = yield select(getDatasourceDraft, id);
+  const currentApplicationIdForCreateNewApp: string | undefined = yield select(
+    getCurrentApplicationIdForCreateNewApp,
+  );
   const pageId: string = yield select(getCurrentPageId);
   let data;
   if (isEmpty(draft)) {
@@ -1173,7 +1176,8 @@ function* changeDatasourceSaga(
     ),
   );
   // on reconnect modal, it shouldn't be redirected to datasource edit page
-  if (shouldNotRedirect) return;
+  // on create new app onboarding flow, it shouldn't redirect either
+  if (shouldNotRedirect || currentApplicationIdForCreateNewApp) return;
   // this redirects to the same route, so checking first.
   const datasourcePath = trimQueryString(
     datasourcesEditorIdURL({