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/issue.go

@@ -217,7 +217,6 @@ func SearchIssues(ctx *context.APIContext) {
 
 	var includedAnyLabels []int64
 	{
-
 		labels := ctx.FormTrim("labels")
 		var includedLabelNames []string
 		if len(labels) > 0 {

routers/api/v1/repo/mirror.go

@@ -180,7 +180,6 @@ func ListPushMirrors(ctx *context.APIContext) {
 		if err == nil {
 			responsePushMirrors = append(responsePushMirrors, m)
 		}
-
 	}
 	ctx.SetLinkHeader(len(responsePushMirrors), utils.GetListOptions(ctx).PageSize)
 	ctx.SetTotalCountHeader(count)

routers/api/v1/repo/pull.go

@@ -1058,7 +1058,6 @@ func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption)
 		isSameRepo = true
 		headUser = ctx.Repo.Owner
 		headBranch = headInfos[0]
-
 	} else if len(headInfos) == 2 {
 		headUser, err = user_model.GetUserByName(ctx, headInfos[0])
 		if err != nil {
@@ -1072,7 +1071,6 @@ func parseCompareInfo(ctx *context.APIContext, form api.CreatePullRequestOption)
 		headBranch = headInfos[1]
 		// The head repository can also point to the same repo
 		isSameRepo = ctx.Repo.Owner.ID == headUser.ID
-
 	} else {
 		ctx.NotFound()
 		return nil, nil, nil, nil, "", ""

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

routers/api/v1/repo/repo.go

@@ -1094,7 +1094,6 @@ func updateMirror(ctx *context.APIContext, opts api.EditRepoOption) error {
 
 	// update MirrorInterval
 	if opts.MirrorInterval != nil {
-
 		// MirrorInterval should be a duration
 		interval, err := time.ParseDuration(*opts.MirrorInterval)
 		if err != nil {

routers/api/v1/repo/wiki.go

@@ -478,7 +478,6 @@ func findEntryForFile(commit *git.Commit, target string) (*git.TreeEntry, error)
 func findWikiRepoCommit(ctx *context.APIContext) (*git.Repository, *git.Commit) {
 	wikiRepo, err := gitrepo.OpenWikiRepository(ctx, ctx.Repo.Repository)
 	if err != nil {
-
 		if git.IsErrNotExist(err) || err.Error() == "no such file or directory" {
 			ctx.NotFound(err)
 		} else {