feat: App API v2 (#10077)

# Which Problems Are Solved

This PR *partially* addresses #9450 . Specifically, it implements the
resource based API for the apps. APIs for app keys ARE not part of this
PR.

# How the Problems Are Solved

- `CreateApplication`, `PatchApplication` (update) and
`RegenerateClientSecret` endpoints are now unique for all app types:
API, SAML and OIDC apps.
  - All new endpoints have integration tests
  - All new endpoints are using permission checks V2

# Additional Changes

- The `ListApplications` endpoint allows to do sorting (see protobuf for
details) and filtering by app type (see protobuf).
- SAML and OIDC update endpoint can now receive requests for partial
updates

# Additional Context

Partially addresses #9450

internal/integration/client.go

@@ -22,6 +22,7 @@ import (
 	"github.com/zitadel/zitadel/internal/integration/scim"
 	action "github.com/zitadel/zitadel/pkg/grpc/action/v2beta"
 	"github.com/zitadel/zitadel/pkg/grpc/admin"
+	app "github.com/zitadel/zitadel/pkg/grpc/app/v2beta"
 	"github.com/zitadel/zitadel/pkg/grpc/auth"
 	"github.com/zitadel/zitadel/pkg/grpc/feature/v2"
 	feature_v2beta "github.com/zitadel/zitadel/pkg/grpc/feature/v2beta"
@@ -75,6 +76,7 @@ type Client struct {
 	SCIM           *scim.Client
 	Projectv2Beta  project_v2beta.ProjectServiceClient
 	InstanceV2Beta instance.InstanceServiceClient
+	AppV2Beta      app.AppServiceClient
 }
 
 func NewDefaultClient(ctx context.Context) (*Client, error) {
@@ -114,6 +116,7 @@ func newClient(ctx context.Context, target string) (*Client, error) {
 		SCIM:           scim.NewScimClient(target),
 		Projectv2Beta:  project_v2beta.NewProjectServiceClient(cc),
 		InstanceV2Beta: instance.NewInstanceServiceClient(cc),
+		AppV2Beta:      app.NewAppServiceClient(cc),
 	}
 	return client, client.pollHealth(ctx)
 }