refactor(actions): small cleanups across models, services and routers (#39722)

Collection of small, behaviour-preserving cleanups in the Actions code.

- Fix log and error prefixes that named non-existent or wrong functions,
and wrap errors with `%w` so `errors.Is` keeps working.
- Remove unused code.
- Rely on `ctx.ServerError` / `ctx.APIErrorAuto`, which already map
`util.ErrNotExist` and friends, instead of equivalent hand-written
switches.
- Load runs referenced by commit statuses with one query instead of one
per run (used on every PR view); the result order is now stable.
- Encode an event's payload once instead of up to three times.
- Share the duplicated runner-token "get or create" logic and the
"notify and emit" call pair.
- Simplify `ToActionArtifact` / `ToActionRunner` signatures.

---------

Signed-off-by: bircni <bircni@icloud.com>
Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

routers/web/shared/actions/runners.go

@@ -139,16 +139,9 @@ func Runners(ctx *context.Context) {
 	}
 
 	// ownid=0,repo_id=0,means this token is used for global
-	var token *actions_model.ActionRunnerToken
-	token, err = actions_model.GetLatestRunnerToken(ctx, opts.OwnerID, opts.RepoID)
-	if errors.Is(err, util.ErrNotExist) || (token != nil && !token.IsActive) {
-		token, err = actions_model.NewRunnerToken(ctx, opts.OwnerID, opts.RepoID)
-		if err != nil {
-			ctx.ServerError("CreateRunnerToken", err)
-			return
-		}
-	} else if err != nil {
-		ctx.ServerError("GetLatestRunnerToken", err)
+	token, err := actions_model.GetOrCreateActiveRunnerToken(ctx, opts.OwnerID, opts.RepoID)
+	if err != nil {
+		ctx.ServerError("GetOrCreateActiveRunnerToken", err)
 		return
 	}