[AUDIT] Run knip over twenty-server (#21159)

# Introduction
Run [knip](https://knip.dev/) over twenty-server
Used config:
```json
{
  "$schema": "https://unpkg.com/knip@5/schema.json",
  "workspaces": {
    "packages/twenty-server": {
      "entry": [
        "src/main.ts",
        "src/command/command.ts",
        "src/queue-worker/queue-worker.ts",
        "src/database/scripts/setup-db.ts",
        "src/database/scripts/truncate-db.ts",
        "src/database/clickHouse/migrations/run-migrations.ts",
        "src/database/clickHouse/seeds/run-seeds.ts",
        "src/instrument.ts",
        "lingui.config.ts",
        "test/integration/graphql/codegen/index.ts",
        "test/integration/utils/setup-test.ts",
        "test/integration/utils/teardown-test.ts",
        "scripts/**/*.ts",
        "**/*.spec.ts",
        "**/*.integration-spec.ts"
      ],
      "project": ["src/**/*.ts", "test/**/*.ts", "scripts/**/*.ts"],
      "ignore": [
        "src/database/typeorm/**/migrations/**",
        "src/database/typeorm/**/*.entity.ts",
        "**/*.workspace-entity.ts",
        "**/logic-function-resource/constants/seed-project/**"
      ],
      "ignoreDependencies": ["@types/psl", "@types/aws-lambda"],
      "ignoreBinaries": ["nest", "lingui", "typeorm"]
    }
  }
}
```

packages/twenty-server/src/engine/workspace-manager/workspace-cleaner/exceptions/workspace-cleaner.exception.ts

@@ -1,34 +0,0 @@
-import { type MessageDescriptor } from '@lingui/core';
-import { msg } from '@lingui/core/macro';
-import { assertUnreachable } from 'twenty-shared/utils';
-
-import { CustomException } from 'src/utils/custom-exception';
-
-export enum WorkspaceCleanerExceptionCode {
-  BILLING_SUBSCRIPTION_NOT_FOUND = 'BILLING_SUBSCRIPTION_NOT_FOUND',
-}
-
-const getWorkspaceCleanerExceptionUserFriendlyMessage = (
-  code: WorkspaceCleanerExceptionCode,
-) => {
-  switch (code) {
-    case WorkspaceCleanerExceptionCode.BILLING_SUBSCRIPTION_NOT_FOUND:
-      return msg`Billing subscription not found.`;
-    default:
-      assertUnreachable(code);
-  }
-};
-
-export class WorkspaceCleanerException extends CustomException<WorkspaceCleanerExceptionCode> {
-  constructor(
-    message: string,
-    code: WorkspaceCleanerExceptionCode,
-    { userFriendlyMessage }: { userFriendlyMessage?: MessageDescriptor } = {},
-  ) {
-    super(message, code, {
-      userFriendlyMessage:
-        userFriendlyMessage ??
-        getWorkspaceCleanerExceptionUserFriendlyMessage(code),
-    });
-  }
-}

packages/twenty-server/src/engine/workspace-manager/workspace-migration/universal-flat-entity/utils/add-universal-flat-entity-to-universal-flat-entity-maps-or-throw.util.ts

@@ -1,43 +0,0 @@
-import { isDefined } from 'twenty-shared/utils';
-
-import {
-  FlatEntityMapsException,
-  FlatEntityMapsExceptionCode,
-} from 'src/engine/metadata-modules/flat-entity/exceptions/flat-entity-maps.exception';
-import { type SyncableFlatEntity } from 'src/engine/metadata-modules/flat-entity/types/flat-entity-from.type';
-import { type UniversalSyncableFlatEntity } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-entity-from.type';
-import { type UniversalFlatEntityMaps } from 'src/engine/workspace-manager/workspace-migration/universal-flat-entity/types/universal-flat-entity-maps.type';
-
-type AddUniversalFlatEntityToUniversalFlatEntityMapsOrThrowArgs<
-  T extends SyncableFlatEntity | UniversalSyncableFlatEntity,
-> = {
-  universalFlatEntity: T;
-  universalFlatEntityMaps: UniversalFlatEntityMaps<T>;
-};
-
-export const addUniversalFlatEntityToUniversalFlatEntityMapsOrThrow = <
-  T extends SyncableFlatEntity | UniversalSyncableFlatEntity,
->({
-  universalFlatEntity,
-  universalFlatEntityMaps,
-}: AddUniversalFlatEntityToUniversalFlatEntityMapsOrThrowArgs<T>): UniversalFlatEntityMaps<T> => {
-  if (
-    isDefined(
-      universalFlatEntityMaps.byUniversalIdentifier[
-        universalFlatEntity.universalIdentifier
-      ],
-    )
-  ) {
-    throw new FlatEntityMapsException(
-      'addUniversalFlatEntityToUniversalFlatEntityMapsOrThrow: flat entity to add already exists',
-      FlatEntityMapsExceptionCode.ENTITY_ALREADY_EXISTS,
-    );
-  }
-
-  return {
-    byUniversalIdentifier: {
-      ...universalFlatEntityMaps.byUniversalIdentifier,
-      [universalFlatEntity.universalIdentifier]: universalFlatEntity,
-    },
-  };
-};

packages/twenty-server/src/engine/workspace-manager/workspace-migration/workspace-migration-builder/types/convert-action-type-to-camel-case.type.ts

@@ -1,4 +0,0 @@
-export type ConvertActionTypeToCamelCase<T extends string> =
-  T extends `${infer Before}_${infer After}`
-    ? `${Before}${Capitalize<After>}`
-    : T;