Add tween.running getter and use it in the new added unit tests for tween.stopAll

[dumganhar]

Also add Tween.getRunningCount static method. Feature was requested in https://forum.cocos.org/t/topic/128931

Re: #

Changelog

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Continuous Integration

This pull request:

• [ ] needs automatic test cases check.

  Manual trigger with @cocos-robot run test cases afterward.

• [ ] does not change any runtime related code or build configuration

  If any reviewer thinks the CI checks are needed, please uncheck this option, then close and reopen the issue.

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Compatibility Check

This pull request:

• [ ] changes public API, and have ensured backward compatibility with deprecated features.
• [ ] affects platform compatibility, e.g. system version, browser version, platform sdk version, platform toolchain, language version, hardware compatibility etc.
• [ ] affects file structure of the build package or build configuration which requires user project upgrade.
• [ ] introduces breaking changes, please list all changes, affected features and the scope of violation.

[github-actions[bot]]

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -55041,8 +55041,13 @@
          * @return @en The instance itself for easier chaining. @zh 返回该实例本身，以便于链式调用。
          */
         resume(): Tween<T>;
         /**
+         * @en Checking whether the current tween instance is running.
+         * @zh 检查当前缓动实例是否在运行。
+         */
+        get running(): boolean;
+        /**
          * @en
          * Clone a tween.
          * @zh
          * 克隆当前 tween。
@@ -55238,8 +55243,16 @@
          * @return @en The instance itself for easier chaining. @zh 返回该实例本身，以便于链式调用。
          */
         destroySelf(): __private._cocos_tween_tween__TweenWithNodeTargetOrUnknown<T>;
         /**
+         * @en Get the count of running tween instances those associate with the target.
+         * @zh 获取目标对象关联的正在运行的缓动实例的个数。
+         * @param target @en The target to check. @zh 要检查的目标对象。
+         * @return @en The count of running tween instances those associate with the target.
+         *         @zh 目标对象关联的正在运行的缓动实例的个数。
+         */
+        static getRunningCount<U extends object = any>(target: U): number;
+        /**
          * @en
          * Stop all tween instances.
          * @zh
          * 停止所有缓动实例
@@ -70475,8 +70488,9 @@
              * @method pauseTargets
              * @param {Array} targetsToPause
              */
             pauseTargets<T>(targetsToPause: Array<T>): void;
+            isActionRunning(action: _cocos_tween_actions_action__Action): boolean;
             /**
              * @en The ActionManager update。
              * @zh ActionManager 主循环。
              * @method update