Fix ref links in issue overviews for tags (#8742)

* Properly generate ref URLs

Tags used to not generate correct URLs (src/branch/tags/1.0.0 instead of
src/tags/1.0.0).

Also cleans up some code around it with the created helper functions.

* Fix formatting and create migration

* Add copyright head to utils_test

* Use a raw query for the ref migration

* Remove semicolon

* Quote column and table names in migration SQL

* Change || to CONCAT, since MSSQL does not support ||

* Make migration engine aware

* Add missing import

* Move ref EndName and URL to the issue service

* Fix tests

* Add test for commit refs

* Update issue.go

* Use the right command for building JavaScript bundles

* Prepare for merge

* Check for refs/* before prepending in migration

* Update services/issue/issue_test.go

* Update modules/git/utils_test.go

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
Co-authored-by: techknowlogick <matti@mdranta.net>

routers/user/home.go

@@ -22,6 +22,7 @@ import (
 	"code.gitea.io/gitea/modules/markup/markdown"
 	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/util"
+	issue_service "code.gitea.io/gitea/services/issue"
 	pull_service "code.gitea.io/gitea/services/pull"
 
 	"github.com/keybase/go-crypto/openpgp"
@@ -624,6 +625,9 @@ func Issues(ctx *context.Context) {
 		totalIssues = int(allIssueStats.ClosedCount)
 	}
 
+	ctx.Data["IssueRefEndNames"], ctx.Data["IssueRefURLs"] =
+		issue_service.GetRefEndNamesAndURLs(issues, ctx.Query("RepoLink"))
+
 	ctx.Data["Issues"] = issues
 	ctx.Data["ApprovalCounts"] = func(issueID int64, typ string) int64 {
 		counts, ok := approvalCounts[issueID]