chore: fix oxlint errors (#13434)

#### PR Dependency Tree


* **PR #13434** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

## Summary by CodeRabbit

* **Style**
* Improved clarity of TypeScript error suppression comments across
various test files and helper scripts. Comments now specify the reasons
for ignoring specific type errors, enhancing code readability for
developers.
* **Chores**
* Updated inline comments without affecting application functionality or
user experience. No changes to features, logic, or test outcomes.

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

packages/backend/server/src/__tests__/copilot-provider.spec.ts

@@ -732,7 +732,7 @@ for (const {
                 [
                   ...prompt.finish(
                     messages.reduce(
-                      // @ts-expect-error
+                      // @ts-expect-error params not typed
                       (acc, m) => Object.assign(acc, m.params),
                       {}
                     )
@@ -802,7 +802,7 @@ for (const {
                 [
                   ...prompt.finish(
                     finalMessage.reduce(
-                      // @ts-expect-error
+                      // @ts-expect-error params not typed
                       (acc, m) => Object.assign(acc, m.params),
                       params
                     )

packages/backend/server/src/__tests__/copilot.e2e.ts

@@ -111,7 +111,7 @@ test.before(async t => {
       m.overrideProvider(OpenAIProvider).useClass(MockCopilotProvider);
       m.overrideProvider(GeminiGenerativeProvider).useClass(
         class MockGenerativeProvider extends MockCopilotProvider {
-          // @ts-expect-error
+          // @ts-expect-error type not typed
           override type: CopilotProviderType = CopilotProviderType.Gemini;
         }
       );

packages/backend/server/src/__tests__/copilot.spec.ts

@@ -411,7 +411,7 @@ test('should be able to fork chat session', async t => {
 
   // fork session
   const s1 = (await session.get(sessionId))!;
-  // @ts-expect-error
+  // @ts-expect-error find maybe return undefined
   const latestMessageId = s1.finish({}).find(m => m.role === 'assistant')!.id;
   const forkedSessionId1 = await session.fork({
     userId,

packages/backend/server/src/__tests__/models/feature-user.spec.ts

@@ -125,7 +125,7 @@ test('should not switch user quota if the new quota is the same as the current o
 });
 
 test('should use pro plan as free for selfhost instance', async t => {
-  // @ts-expect-error
+  // @ts-expect-error DEPLOYMENT_TYPE is readonly
   env.DEPLOYMENT_TYPE = 'selfhosted';
   await using module = await createTestingModule();
 

packages/backend/server/src/__tests__/utils/testing-module.ts

@@ -66,7 +66,7 @@ export async function createTestingModule(
   // setting up
   let imports = moduleDef.imports ?? [buildAppModule(globalThis.env)];
   imports =
-    // @ts-expect-error
+    // @ts-expect-error ignore the type error
     imports[0].module?.name === 'AppModule'
       ? imports
       : dedupeModules([