QueryCaching: Use CachingServiceClient for query caching (#112128)

* Integrate mt querier with query caching

* typo

* let the caller set cache status response header

* fix TestQueryAPI

* make gen-go

* handle CachingServiceClient being nil and make gen-go

* include namespace in cache key

* set signed in user namespace in query_test.go

* fix test

* remove commented out code

* undo services/query/query.go changes

* make gen-go

* remove namespace requirement

* fix tests

* fix test

* remove namespace from SignedInUser in tests

* make gen-go

pkg/server/wire.go

@@ -70,6 +70,7 @@ import (
 	"github.com/grafana/grafana/pkg/services/auth/jwt"
 	"github.com/grafana/grafana/pkg/services/authn/authnimpl"
 	"github.com/grafana/grafana/pkg/services/authz"
+	"github.com/grafana/grafana/pkg/services/caching"
 	"github.com/grafana/grafana/pkg/services/cleanup"
 	"github.com/grafana/grafana/pkg/services/cloudmigration/cloudmigrationimpl"
 	"github.com/grafana/grafana/pkg/services/contexthandler"
@@ -431,6 +432,7 @@ var wireBasicSet = wire.NewSet(
 	idimpl.ProvideService,
 	wire.Bind(new(auth.IDService), new(*idimpl.Service)),
 	cloudmigrationimpl.ProvideService,
+	caching.ProvideCachingServiceClient,
 	userimpl.ProvideVerifier,
 	connectors.ProvideOrgRoleMapper,
 	wire.Bind(new(user.Verifier), new(*userimpl.Verifier)),