[Bug][http-client-js]: `@noAuth` at namespace level is not properly supported

[qiaozha]

Describe the bug

In todoApp, we have noAuth decorated on the namespace Users

@useAuth(NoAuth)
namespace Users { }

the generated ./src/api/usersClient/usersClientContext.ts file should pass undefined to getClient instead of an undefine credential

export function createUsersClientContext(
  endpoint: string,
  options?: UsersClientOptions,): UsersClientContext {
  const params: Record<string, any> = {
    endpoint: endpoint
  };
  const resolvedEndpoint = "{endpoint}".replace(/{([^}]+)}/g, (_, key) =>
    key in params ? String(params[key]) : (() => { throw new Error(`Missing parameter: ${key}`); })()
-  );;return getClient(resolvedEndpoint,credential,{
+  );;return getClient(resolvedEndpoint,undefined,{
    ...options,
  })
}

Reproduction

https://github.com/allenjzhang/typespec-e2e-demo/tree/main/todoApp/spec

Checklist

• Follow our Code of Conduct
• Check that there isn't already an issue that request the same bug to avoid creating a duplicate.
• Check that this is a concrete bug. For Q&A open a GitHub Discussion.
• The provided reproduction is a minimal reproducible example of the bug.

[lirenhe]

@joheredi, I still got the following error message for the ToDo project, could you help to take a look? thanks

> test-package@1.0.0 build
> tsc



src/api/usersClient/usersClientContext.ts:15:40 - error TS2552: Cannot find name 'credential'. Did you mean 'Credential'?



15   );;return getClient(resolvedEndpoint,credential,{
                                          ~~~~~~~~~~

  node_modules/typescript/lib/lib.dom.d.ts:6401:13
    6401 declare var Credential: {
                     ~~~~~~~~~~
    'Credential' is declared here.



src/models/internal/serializers.ts:153:96 - error TS2345: Argument of type 'FileContents' is not assignable to parameter of type 'Uint8Array<ArrayBufferLike> | null | undefined'.
  Type 'string' is not assignable to type 'Uint8Array<ArrayBufferLike>'.

153     "contentType": input_.contentType,"filename": input_.filename,"contents": encodeUint8Array(input_.contents, "base64")!
                                                                                                   ~~~~~~~~~~~~~~~
Found 2 errors in 2 files.
Errors  Files
     1  src/api/usersClient/usersClientContext.ts:15
     1  src/models/internal/serializers.ts:153 

[qiaozha]

@lirenhe the latest @typespec/http-client-js is still 0.3.0, but I tried latest dev yesterday 0.4.0-dev.1 there seems to have another problem there which cause the generation fail, and we can't verify further.