fix(oidc): use authenticated encryption for opaque tokens (#12017)

# Which Problems Are Solved

Opaque tokens now use authenticated encryption.

# How the Problems Are Solved

- Upgrade zitadel/oidc to v3.47
- Copy crypto implementation for refresh and session tokens (internal to
zitadel)
- Added config that allows validating old tokens for gradual roll-out

# Additional Changes

- Set NX cache for `integration-test-build` to `false`, working on a
seperate fix.

# Additional Context

- closes #11315

---------

Co-authored-by: copilot-swe-agent[bot] <[email protected]>
Co-authored-by: muhlemmer <[email protected]>

internal/api/oidc/token.go

@@ -2,7 +2,6 @@ package oidc
 
 import (
 	"context"
-	"encoding/base64"
 	"slices"
 	"time"
 
@@ -145,15 +144,3 @@ func (s *Server) createJWT(ctx context.Context, client op.Client, session *comma
 
 	return crypto.Sign(claims, signer)
 }
-
-// decryptCode decrypts a code or refresh_token
-func (s *Server) decryptCode(ctx context.Context, code string) (_ string, err error) {
-	_, span := tracing.NewSpan(ctx)
-	defer func() { span.EndWithError(err) }()
-
-	decoded, err := base64.RawURLEncoding.DecodeString(code)
-	if err != nil {
-		return "", err
-	}
-	return s.encAlg.DecryptString(decoded, s.encAlg.EncryptionKeyID())
-}