[QRQC_2] No implicitAny in twenty-server (#12075)

# Introduction
Following https://github.com/twentyhq/twenty/pull/12068
Related with https://github.com/twentyhq/core-team-issues/issues/975

We're enabling `noImplicitAny` handled few use case manually, added a
`ts-expect-error` to the others, we should plan to handle them in the
future

packages/twenty-server/src/engine/core-modules/feature-flag/services/__tests__/feature-flag.service.spec.ts

@@ -212,6 +212,7 @@ describe('FeatureFlagService', () => {
       // Assert
       expect(result).toEqual(mockFeatureFlag);
       expect(mockFeatureFlagRepository.save).toHaveBeenCalledWith({
+        // @ts-expect-error legacy noImplicitAny
         key: FeatureFlagKey[featureFlag],
         value,
         workspaceId,

packages/twenty-server/src/engine/core-modules/feature-flag/services/feature-flag.service.ts

@@ -99,6 +99,7 @@ export class FeatureFlagService {
       ),
     );
 
+    // @ts-expect-error legacy noImplicitAny
     const featureFlagKey = FeatureFlagKey[featureFlag];
 
     if (shouldBePublic) {

packages/twenty-server/src/engine/core-modules/feature-flag/validates/feature-flag.validate.ts

@@ -7,6 +7,7 @@ const assertIsFeatureFlagKey = (
   featureFlagKey: string,
   exceptionToThrow: CustomException,
 ): asserts featureFlagKey is FeatureFlagKey => {
+  // @ts-expect-error legacy noImplicitAny
   if (isDefined(FeatureFlagKey[featureFlagKey])) return;
   throw exceptionToThrow;
 };