feat(api): allow filtering apps by client id and entity id (#11385)

# Which Problems Are Solved

There's currently no way to retrieve a project based on the client_id of
an application. A developer would need to iterate through all projects
and their applications to make the correlation.

# How the Problems Are Solved

- Added a possibility to filter for `client_id` and `entity_id` on the
ListApplications endpoint.
- Added the `project_id` on the `Application` response (used on the
ListApplications endpoint).

# Additional Changes

None

# Additional Context

- closes #11340 
- requires backport to v4.x

internal/api/grpc/application/v2/integration_test/server_test.go

@@ -80,8 +80,9 @@ func samlMetadataGen(entityID string) []byte {
 	return []byte(str)
 }
 
-func createSAMLAppWithName(t *testing.T, baseURI, projectID string) ([]byte, *application.CreateApplicationResponse, string) {
-	samlMetas := samlMetadataGen(integration.URL())
+func createSAMLAppWithName(t *testing.T, baseURI, projectID string) ([]byte, *application.CreateApplicationResponse, string, string) {
+	entityID := integration.URL()
+	samlMetas := samlMetadataGen(entityID)
 	appName := integration.ApplicationName()
 
 	appForSAMLConfigChange, appSAMLConfigChangeErr := instance.Client.ApplicationV2.CreateApplication(IAMOwnerCtx, &application.CreateApplicationRequest{
@@ -104,11 +105,11 @@ func createSAMLAppWithName(t *testing.T, baseURI, projectID string) ([]byte, *ap
 	})
 	require.Nil(t, appSAMLConfigChangeErr)
 
-	return samlMetas, appForSAMLConfigChange, appName
+	return samlMetas, appForSAMLConfigChange, appName, entityID
 }
 
 func createSAMLApp(t *testing.T, baseURI, projectID string) ([]byte, *application.CreateApplicationResponse) {
-	metas, app, _ := createSAMLAppWithName(t, baseURI, projectID)
+	metas, app, _, _ := createSAMLAppWithName(t, baseURI, projectID)
 	return metas, app
 }