PKCE parameters not copied by oauthForm.js

[teddyjtorres]

Describe the bug
The consent page, while calling /authorize endpoint, does not pass all parameters from original request. This causes the PKCE's code_challenge and code_challenge_method parameters to be missing, resulting in an error from the authorization endpoint,

"CWOAU0033E%3A+A+required+runtime+parameter+was+missing%3A+code_challenge"

Steps to Reproduce
Enable proofKeyForCodeExchange and publicClient for the registered OpenID Connect Client at the Liberty's Provider. Attempt to access a protected resource, then the request to the /authorize endpoint will contain the PKCE's code_challenge and code_challenge_method parameters. The consent page should be displayed. User consents. Then, Liberty OP's /authorize endpoint will return a response with an "error" and "error_description" with the CWOAU0033E message.

Expected behavior
The PKCE's parameters should be accepted.

Diagnostic information:

• OpenLiberty Version: [e.g. 21.0.0.8 - 21.0.0.10]
• Affected feature(s) openidConnectServer-1.0
• Java Version: [i.e. full output of java -version]
• server.xml configuration (WITHOUT sensitive information like passwords)
• If it would be useful, upload the messages.log file found in $WLP_OUTPUT_DIR/messages.log

Additional context
Add any other context about the problem here.

[rinkishimo]

hi, there is one more prerequisition while reproducing the bug: client must not have preauthorized all scopes ("preauthorized_scope": "openid profile email phone"). it would skip the consent page.