Plugins: Refactor creation of plugin context to dedicated service (#66451)

* first pass

* fix tests

* return errs

* change signature

* tidy

* delete unnecessary fields from test

* tidy

* fix tests

* simplify

* separate error check in API

* apply nits

pkg/services/publicdashboards/api/common_test.go

@@ -25,8 +25,11 @@ import (
 	fakeDatasources "github.com/grafana/grafana/pkg/services/datasources/fakes"
 	datasourceService "github.com/grafana/grafana/pkg/services/datasources/service"
 	"github.com/grafana/grafana/pkg/services/featuremgmt"
+	"github.com/grafana/grafana/pkg/services/pluginsintegration/plugincontext"
+	pluginSettings "github.com/grafana/grafana/pkg/services/pluginsintegration/pluginsettings/service"
 	"github.com/grafana/grafana/pkg/services/publicdashboards"
 	"github.com/grafana/grafana/pkg/services/query"
+	fakeSecrets "github.com/grafana/grafana/pkg/services/secrets/fakes"
 	"github.com/grafana/grafana/pkg/services/user"
 	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/web"
@@ -129,13 +132,24 @@ func buildQueryDataService(t *testing.T, cs datasources.CacheService, fpc *fakeP
 		}
 	}
 
+	ds := &fakeDatasources.FakeDataSourceService{}
+	pCtxProvider := plugincontext.ProvideService(localcache.ProvideService(), &plugins.FakePluginStore{
+		PluginList: []plugins.PluginDTO{
+			{
+				JSONData: plugins.JSONData{
+					ID: "mysql",
+				},
+			},
+		},
+	}, ds, pluginSettings.ProvideService(store, fakeSecrets.NewFakeSecretsService()))
+
 	return query.ProvideService(
 		setting.NewCfg(),
 		cs,
 		nil,
 		&fakePluginRequestValidator{},
-		&fakeDatasources.FakeDataSourceService{},
 		fpc,
+		pCtxProvider,
 	)
 }