Add useClientIdAsSubClaimForAppTokens and omitUsernameInIntrospectionRespForAppTokens configs to app

[mpmadhavig]

Proposed changes in this pull request

useClientIdAsSubClaimForAppTokens and omitUsernameInIntrospectionRespForAppTokens configs are being introduce to support the on the fly migration for client apps for the issue mentioned in [1].

The configs values will be default false for old apps, default true for new apps. Old app owners can do necessary changes and change the config value to true marking a successful migration.

Please note that the behavioral changes introduced in this PR will only get effective, only when the below configs are enabled.

[oauth]
use_client_id_as_sub_claim_for_app_tokens = false
remove_username_from_introspection_response_for_app_tokens = false

[1] wso2/product-is#16060

Related Issues:

• Migration of sub claim & introspection endpoint username claim for Application tokens wso2/product-is#20917

[Thumimku]

Why we need this?

[mpmadhavig]

Need to remove. This was used earlier, then replaced usage with parse boolean.
Removed with a52e255

[jenkins-is-staging]

PR builder started
Link: https://github.com/wso2/product-is/actions/runs/10484839077

[jenkins-is-staging]

PR builder completed
Link: https://github.com/wso2/product-is/actions/runs/10484839077
Status: success

[jenkins-is-staging]

Approving the pull request based on the successful pr build https://github.com/wso2/product-is/actions/runs/10484839077