## Description
This pull request adds the `initDatasourceConnectionDuringImportRequest`
action to the `partialImportSaga` function in order to initialize the
datasource connection during the partial import process.
<ins>Root cause</ins>
During partial import, we were not initializing the datasources with
default values.
This for some reason, happens only from client side and has no handling
on the server side. We replicated the flow during normal import and
added a call to this redux
event(`INIT_DATASOURCE_CONNECTION_DURING_IMPORT_REQUEST`), which ensured
that our datasources were initialized with defaults.
#### PR fixes following issue(s)
Fixes#29915
#### Media
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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
>
#### How Has This Been Tested?
> Please describe the tests that you ran to verify your changes. Also
list any relevant details for your test configuration.
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- [ ] Manual
- [ ] JUnit
- [ ] Jest
- [ ] Cypress
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#### Test Plan
> Add Testsmith test cases links that relate to this PR
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#### Issues raised during DP testing
> Link issues raised during DP testing for better visiblity and tracking
(copy link from comments dropped on this PR)
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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**
- Enhanced widget import process with automatic datasource connection
initialization.
- **Refactor**
- Improved internal checks for datasource connections during import
workflows.
- **Documentation**
- Updated comments and documentation to reflect new logic for datasource
initialization.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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