chore(oidc): remove legacy storage methods (#10061)

# Which Problems Are Solved

Stabilize the optimized introspection code and cleanup unused code.

# How the Problems Are Solved

- `oidc_legacy_introspection` feature flag is removed and reserved.
- `OPStorage` which are no longer needed have their bodies removed.
- The method definitions need to remain in place so the interface
remains implemented.
  - A panic is thrown in case any such method is still called

# Additional Changes

- A number of `OPStorage` methods related to token creation were already
unused. These are also cleaned up.

# Additional Context

- Closes #10027 
- #7822

---------

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/api/oidc/jwt-profile.go

@@ -3,38 +3,9 @@ package oidc
 import (
 	"context"
 
-	"github.com/zitadel/oidc/v3/pkg/oidc"
 	"github.com/zitadel/oidc/v3/pkg/op"
-
-	"github.com/zitadel/zitadel/internal/domain"
-	"github.com/zitadel/zitadel/internal/telemetry/tracing"
-	"github.com/zitadel/zitadel/internal/zerrors"
 )
 
-func (o *OPStorage) JWTProfileTokenType(ctx context.Context, request op.TokenRequest) (_ op.AccessTokenType, err error) {
-	ctx, span := tracing.NewSpan(ctx)
-	defer func() {
-		err = oidcError(err)
-		span.EndWithError(err)
-	}()
-
-	mapJWTProfileScopesToAudience(ctx, request)
-	user, err := o.query.GetUserByID(ctx, false, request.GetSubject())
-	if err != nil {
-		return 0, err
-	}
-	// the user should always be a machine, but let's just be sure
-	if user.Machine == nil {
-		return 0, zerrors.ThrowInvalidArgument(nil, "OIDC-jk26S", "invalid client type")
-	}
-	return accessTokenTypeToOIDC(user.Machine.AccessTokenType), nil
-}
-
-func mapJWTProfileScopesToAudience(ctx context.Context, request op.TokenRequest) {
-	// the request should always be a JWTTokenRequest, but let's make sure
-	jwt, ok := request.(*oidc.JWTTokenRequest)
-	if !ok {
-		return
-	}
-	jwt.Audience = domain.AddAudScopeToAudience(ctx, jwt.Audience, jwt.Scopes)
+func (o *OPStorage) JWTProfileTokenType(context.Context, op.TokenRequest) (op.AccessTokenType, error) {
+	panic(o.panicErr("JWTProfileTokenType"))
 }