fix: jest test failures coz of getIsAnvilLayout (#32664)

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## Description
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Fixes #`Issue Number`  
_or_  
Fixes `Issue URL`
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## Automation

/ok-to-test tags="@tag.All"

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

## Summary by CodeRabbit

- **Refactor**
- Simplified the logic for determining the layout system type in the
app.
- **Tests**
- Updated test files to remove unnecessary mock implementations related
to layout system checks.

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

app/client/src/layoutSystems/anvil/integrations/selectors.ts

@@ -1,6 +1,5 @@
 import type { AppState } from "@appsmith/reducers";
 import { LayoutComponentTypes, type LayoutProps } from "../utils/anvilTypes";
-import { createSelector } from "reselect";
 import { selectFeatureFlagCheck } from "@appsmith/selectors/featureFlagsSelectors";
 import { FEATURE_FLAG } from "@appsmith/entities/FeatureFlag";
 import { LayoutSystemTypes } from "layoutSystems/types";
@@ -10,12 +9,10 @@ export const getIsAnvilLayoutEnabled = (state: AppState) => {
   return selectFeatureFlagCheck(state, FEATURE_FLAG.release_anvil_enabled);
 };
 
-export const getIsAnvilLayout = createSelector(
-  getLayoutSystemType,
-  (layoutSystemType) => {
-    return layoutSystemType === LayoutSystemTypes.ANVIL;
-  },
-);
+export const getIsAnvilLayout = (state: AppState) => {
+  const layoutSystemType = getLayoutSystemType(state);
+  return layoutSystemType === LayoutSystemTypes.ANVIL;
+};
 
 // ToDo: This is a placeholder implementation this is bound to change
 export function getDropTargetLayoutId(state: AppState, canvasId: string) {

app/client/src/layoutSystems/fixedlayout/editor/FixedLayoutCanvasArenas/CanvasSelectionArena.test.tsx

@@ -13,7 +13,6 @@ import { sagasToRunForTests } from "test/sagas";
 import {
   MockApplication,
   mockCreateCanvasWidget,
-  mockGetIsAnvilLayout,
   mockGetWidgetEvalValues,
   MockPageDSL,
   syntheticTestMouseEvent,
@@ -24,16 +23,12 @@ import { generateReactKey } from "utils/generators";
 import * as widgetRenderUtils from "utils/widgetRenderUtils";
 import * as widgetSelectionsActions from "actions/widgetSelectionActions";
 import { SelectionRequestType } from "sagas/WidgetSelectUtils";
-import * as anvilSelectors from "layoutSystems/anvil/integrations/selectors";
 import Canvas from "pages/Editor/Canvas";
 
 describe("Canvas selection test cases", () => {
   jest
     .spyOn(dataTreeSelectors, "getWidgetEvalValues")
     .mockImplementation(mockGetWidgetEvalValues);
-  jest
-    .spyOn(anvilSelectors, "getIsAnvilLayout")
-    .mockImplementation(mockGetIsAnvilLayout);
   jest
     .spyOn(utilities, "computeMainContainerWidget")
     .mockImplementation((widget) => widget as any);

app/client/src/sagas/WidgetBlueprintSagas.test.ts

@@ -1,14 +1,9 @@
-import * as anvilSelectors from "layoutSystems/anvil/integrations/selectors";
-import { mockGetIsAnvilLayout } from "test/testCommon";
 import WidgetFactory from "WidgetProvider/factory";
 import { BlueprintOperationTypes } from "WidgetProvider/constants";
 
 import type { BlueprintOperation } from "./WidgetBlueprintSagas";
 import { executeWidgetBlueprintChildOperations } from "./WidgetBlueprintSagas";
 
-jest
-  .spyOn(anvilSelectors, "getIsAnvilLayout")
-  .mockImplementation(mockGetIsAnvilLayout);
 describe("WidgetBlueprintSagas", () => {
   it("should returns widgets after executing the child operation", async () => {
     const mockBlueprintChildOperation: BlueprintOperation = {

app/client/test/testCommon.ts

@@ -137,10 +137,6 @@ export const mockGetWidgetEvalValues = (
   ) as WidgetEntity;
 };
 
-export const mockGetIsAnvilLayout = (state: AppState) => {
-  return false;
-};
-
 export const syntheticTestMouseEvent = (
   event: MouseEvent,
   optionsToAdd = {},