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/api/v1/repo/pull_review.go

@@ -875,7 +875,6 @@ func apiReviewRequest(ctx *context.APIContext, opts api.PullReviewRequestOptions
 	}
 
 	if ctx.Repo.Repository.Owner.IsOrganization() && len(opts.TeamReviewers) > 0 {
-
 		teamReviewers := make([]*organization.Team, 0, len(opts.TeamReviewers))
 		for _, t := range opts.TeamReviewers {
 			var teamReviewer *organization.Team