Run go generate and go vet on all packages (#30529)

Fixes: https://github.com/go-gitea/gitea/issues/30512

I think this does mean those tools would run on a potential `vendor`
directory, but I'm not sure we really support vendoring of dependencies
anymore.

`release` has a `vendor` prerequisite so likely the source tarballs
contain vendor files?

tests/integration/repo_mergecommit_revert_test.go

@@ -1,3 +1,6 @@
+// Copyright 2024 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
 package integration
 
 import (