Replace remaining calls to testing.Short where possible. (#110765)

* Replace remaining calls to testing.Short where possible.
* Update style guide.
* Revert change in TestAlertmanager_ExtraDedupStage, as it doesn't work.
* Make TestAlertRulePostExport into integration test.

pkg/tsdb/influxdb/fsql/fsql_test.go

@@ -55,7 +55,7 @@ func (suite *FSQLTestSuite) AfterTest(suiteName, testName string) {
 	suite.server.Shutdown()
 }
 
-func TestFSQLTestSuite(t *testing.T) {
+func TestIntegrationFSQLTestSuite(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test in short mode")
 	}

pkg/tsdb/mysql/mysql_snapshot_test.go

@@ -36,11 +36,8 @@ func TestIntegrationMySQLSnapshots(t *testing.T) {
 	if testing.Short() {
 		t.Skip("skipping integration test in short mode")
 	}
-	shouldRunTest := func() bool {
-		if testing.Short() {
-			return false
-		}
 
+	shouldRunTest := func() bool {
 		testDbName, present := os.LookupEnv("GRAFANA_TEST_DB")
 
 		if present && testDbName == "mysql" {