Add option to initialize repository with labels (#6061)

* Add optional label sets on repo creation

* Fix CRLF

* Instead of hardcoding default, make it the helper

* Move label set init out of repo init

Add a new error for the router
Combine router label init with repo creation label init

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Add issue labels to Swagger for repo creation

Signed-off-by: jolheiser <john.olheiser@gmail.com>

* Update models/issue_label.go

Co-Authored-By: Lauris BH <lauris@nix.lv>

* Update models/issue_label.go

Co-Authored-By: guillep2k <18600385+guillep2k@users.noreply.github.com>

routers/api/v1/repo/repo.go

@@ -206,6 +206,7 @@ func CreateUserRepo(ctx *context.APIContext, owner *models.User, opt api.CreateR
 	repo, err := models.CreateRepository(ctx.User, owner, models.CreateRepoOptions{
 		Name:        opt.Name,
 		Description: opt.Description,
+		IssueLabels: opt.IssueLabels,
 		Gitignores:  opt.Gitignores,
 		License:     opt.License,
 		Readme:      opt.Readme,