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/command/command.go

@@ -183,7 +183,7 @@ func StartCommands(
 		EventGroupExisting:     func(group string) bool { return true },
 		GrpcServiceExisting:    func(service string) bool { return false },
 		GrpcMethodExisting:     func(method string) bool { return false },
-		ActionFunctionExisting: domain.FunctionExists(),
+		ActionFunctionExisting: domain.ActionFunctionExists(),
 		multifactors: domain.MultifactorConfigs{
 			OTP: domain.OTPConfig{
 				CryptoMFA: otpEncryption,