Enable more revive linter rules (#30608)

Noteable additions:

- `redefines-builtin-id` forbid variable names that shadow go builtins
- `empty-lines` remove unnecessary empty lines that `gofumpt` does not
remove for some reason
- `superfluous-else` eliminate more superfluous `else` branches

Rules are also sorted alphabetically and I cleaned up various parts of
`.golangci.yml`.

(cherry picked from commit 74f0c84fa4245a20ce6fb87dac1faf2aeeded2a2)

Conflicts:
	.golangci.yml
	apply the linter recommendations to Forgejo code as well

routers/web/repo/view.go

@@ -352,7 +352,6 @@ func loadLatestCommitData(ctx *context.Context, latestCommit *git.Commit) bool {
 	// or of directory if not in root directory.
 	ctx.Data["LatestCommit"] = latestCommit
 	if latestCommit != nil {
-
 		verification := asymkey_model.ParseCommitWithSignature(ctx, latestCommit)
 
 		if err := asymkey_model.CalculateTrustStatus(verification, ctx.Repo.Repository.GetTrustModel(), func(user *user_model.User) (bool, error) {