Implement auto-cancellation of concurrent jobs if the event is push (#25716)

- cancel running jobs if the event is push
- Add a new function `CancelRunningJobs` to cancel all running jobs of a
run
- Update `FindRunOptions` struct to include `Ref` field and update its
condition in `toConds` function
- Implement auto cancellation of running jobs in the same workflow in
`notify` function

related task: https://github.com/go-gitea/gitea/pull/22751/

---------

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Signed-off-by: appleboy <appleboy.tw@gmail.com>
Co-authored-by: Jason Song <i@wolfogre.com>
Co-authored-by: delvh <dev.lh@web.de>

models/migrations/v1_21/v268.go

@@ -0,0 +1,16 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package v1_21 //nolint
+
+import (
+	"xorm.io/xorm"
+)
+
+// UpdateActionsRefIndex updates the index of actions ref field
+func UpdateActionsRefIndex(x *xorm.Engine) error {
+	type ActionRun struct {
+		Ref string `xorm:"index"` // the commit/tag/… causing the run
+	}
+	return x.Sync(new(ActionRun))
+}