feat: actions v2 for functions (#9420)

# Which Problems Are Solved

Actions v2 are not executed in different functions, as provided by the
actions v1.

# How the Problems Are Solved

Add functionality to call actions v2 through OIDC and SAML logic to
complement tokens and SAMLResponses.

# Additional Changes

- Corrected testing for retrieved intent information
- Added testing for IDP types
- Corrected handling of context for issuer in SAML logic

# Additional Context

- Closes #7247 
- Dependent on https://github.com/zitadel/saml/pull/97
- docs for migration are done in separate issue:
https://github.com/zitadel/zitadel/issues/9456

---------

Co-authored-by: Silvan <27845747+adlerhurst@users.noreply.github.com>

internal/api/saml/provider.go

@@ -1,6 +1,7 @@
 package saml
 
 import (
+	"context"
 	"fmt"
 	"net/http"
 
@@ -83,7 +84,7 @@ func NewProvider(
 
 	p, err := provider.NewProvider(
 		provStorage,
-		HandlerPrefix,
+		IssuerFromContext,
 		conf.ProviderConfig,
 		options...,
 	)
@@ -96,6 +97,16 @@ func NewProvider(
 	}, nil
 }
 
+func ContextToIssuer(ctx context.Context) string {
+	return http_utils.DomainContext(ctx).Origin() + HandlerPrefix
+}
+
+func IssuerFromContext(_ bool) (provider.IssuerFromRequest, error) {
+	return func(r *http.Request) string {
+		return ContextToIssuer(r.Context())
+	}, nil
+}
+
 func newStorage(
 	command *command.Commands,
 	query *query.Queries,