fix: atx bearer no longers update credential metadata (#732)

## Problem
Q relies on credential metadata for determining connection type. This is
not necessary for atx-bearer since ATX only supports IDC connections.
When ATX signs in, this caused the credential metadata to be overwritten
and cause issues with Q if users used builderID to sign in.

## Solution
When handling credential updates for ATX, we no longer updates the
credential metadata so original Q auth is preserved.

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## License

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Author: gzmiao8

runtimes/runtimes/auth/auth.ts

@@ -202,10 +202,9 @@ export class Auth {
                     this.atxCredentials = bearerCredentials
                 } else {
                     this.connection.console.info('Runtime: Storing Q credentials in bearer')
+                    await this.handleBearerCredentialsMetadata(request.metadata)
                     this.setCredentials(bearerCredentials)
                 }
-
-                await this.handleBearerCredentialsMetadata(request.metadata)
                 this.connection.console.info('Runtime: Successfully saved bearer credentials')
             } else {
                 this.bearerCredentials = undefined