[OID4VCI]: Add UI support for vc.credential_signing_alg_values_supported in OID4VCI client scopes

[forkimenjeckayang]

Summary

Adds frontend support for configuring vc.credential_signing_alg_values_supported attribute in OID4VCI client scopes. This attribute was recently renamed from proof_signing_alg_values_supported on the backend.

Changes

• Added TextControl field in ScopeForm.tsx for vc.credential_signing_alg_values_supported with comma-separated list validation
• Added translation strings (credentialSigningAlgorithmsSupported and credentialSigningAlgorithmsSupportedHelp) to messages_en.properties
• Extended Playwright tests to verify field visibility, persistence, and proper hiding when OID4VCI protocol is not selected

Closses

• Issue: Add UI Support for vc.credential_signing_alg_values_supported in OID4VCI Client Scopes #204

[forkimenjeckayang]

This branch takes root from feat/oid4vci-signing-alg-rename but can be removed based on this commit 010ca21

[IngridPuppet]

You'll have to create the upstream Keycloak ticket and indicate the dependence on keycloak#44621

[IngridPuppet]

There is a move to make the configuration property singular from vc.credential_signing_alg_values_supported to vc.credential_signing_alg. See #212.

@forkimenjeckayang - Please could you update this PR accordingly? In particular, pay attention to labels and descriptions.

[forkimenjeckayang]

There is a move to make the configuration property singular from vc.credential_signing_alg_values_supported to vc.credential_signing_alg. See #212.

@forkimenjeckayang - Please could you update this PR accordingly? In particular, pay attention to labels and descriptions.

Definitely @IngridPuppet , thank you for mentioning