Profiling: Add Phlare and Parca datasources (#57809)

* Add phlare datasource

* Rename

* Add parca

* Add self field to parca

* Make sure phlare works with add to dashboard flow

* Add profiling category and hide behind feature flag

* Update description and logos

* Update phlare icon

* Cleanup logging

* Clean up logging

* Fix for shift+enter

* onRunQuery to set label

* Update type naming

* Fix lint

* Fix test and quality issues

Co-authored-by: Joey Tawadrous <joey.tawadrous@grafana.com>

pkg/tsdb/phlare/instance_test.go

@@ -0,0 +1,64 @@
+package phlare
+
+import (
+	"context"
+	"testing"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/stretchr/testify/require"
+)
+
+// This is where the tests for the datasource backend live.
+func Test_QueryData(t *testing.T) {
+	ds := PhlareDatasource{}
+
+	resp, err := ds.QueryData(
+		context.Background(),
+		&backend.QueryDataRequest{
+			Queries: []backend.DataQuery{
+				{RefID: "A"},
+			},
+		},
+	)
+	if err != nil {
+		t.Error(err)
+	}
+
+	if len(resp.Responses) != 1 {
+		t.Fatal("QueryData must return a response")
+	}
+}
+
+func Test_CallResource(t *testing.T) {
+	ds := &PhlareDatasource{
+		client: &FakeClient{},
+	}
+
+	t.Run("series resource", func(t *testing.T) {
+		sender := &FakeSender{}
+		err := ds.CallResource(
+			context.Background(),
+			&backend.CallResourceRequest{
+				PluginContext: backend.PluginContext{},
+				Path:          "series",
+				Method:        "GET",
+				URL:           "series?matchers=%7B%7D",
+				Headers:       nil,
+				Body:          nil,
+			},
+			sender,
+		)
+		require.NoError(t, err)
+		require.Equal(t, 200, sender.Resp.Status)
+		require.Equal(t, `[{"labels":[{"name":"instance","value":"127.0.0.1"},{"name":"job","value":"default"}]}]`, string(sender.Resp.Body))
+	})
+}
+
+type FakeSender struct {
+	Resp *backend.CallResourceResponse
+}
+
+func (fs *FakeSender) Send(resp *backend.CallResourceResponse) error {
+	fs.Resp = resp
+	return nil
+}