Chore: a bit of spring cleaning (#16710)

* Chore: use early return technic everywhere

And enable "indent-error-flow" revive rule

* Chore: remove if-return rule from revive config

* Chore: improve error messages

And enable "error-strings" revive rule

* Chore: enable "error-naming" revive rule

* Chore: make linter happy

* Chore: do not duplicate gofmt execution

* Chore: make linter happy

* Chore: address the pull review comments

pkg/infra/usagestats/usage_stats.go

@@ -171,7 +171,6 @@ func (uss *UsageStatsService) updateTotalStats() {
 func getEdition() string {
 	if setting.IsEnterprise {
 		return "enterprise"
-	} else {
-		return "oss"
 	}
+	return "oss"
 }