Fix AwaitingNonWebApplicationListener await with parent context

[ishankhemani]

fix #13722

Description

AwaitingNonWebApplicationListener should only enter the await state for the
root, non-web ApplicationContext.
When a parent–child context hierarchy is present, the listener must not await
during child context shutdown.

This PR ensures the listener behaves correctly with multiple non-web
application contexts and adds a focused regression test to cover this scenario.

Changes

Prevent awaiting logic from being triggered by child ApplicationContext

Add unit test for non-web parent–child context lifecycle

Testing

Added testMultipleContextNonWebApplication

Tests pass locally

Fixes #13722
please review it sir when you get time @AlbumenJ @RainYuY

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 58.75%. Comparing base (2daf878) to head (ddec94d).

Files with missing lines	Patch %	Lines
...ntext/event/AwaitingNonWebApplicationListener.java	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15981      +/-   ##
============================================
- Coverage     60.72%   58.75%   -1.98%     
+ Complexity    11734       15   -11719     
============================================
  Files          1949     1949              
  Lines         88799    88799              
  Branches      13391    13392       +1     
============================================
- Hits          53922    52172    -1750     
- Misses        29338    30972    +1634     
- Partials       5539     5655     +116     

Flag	Coverage Δ
integration-tests-java21	?
integration-tests-java8	?
samples-tests-java21	?
samples-tests-java8	?
unit-tests-java11	59.00% <0.00%> (+<0.01%)	⬆️
unit-tests-java17	58.48% <0.00%> (-0.03%)	⬇️
unit-tests-java21	58.49% <0.00%> (+<0.01%)	⬆️
unit-tests-java25	58.43% <0.00%> (-0.03%)	⬇️
unit-tests-java8	59.02% <0.00%> (+0.03%)	⬆️

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[zrlw]

This pr might conflict with current shutdown hook mechanism, many providers of dubbo-sample projects shutdown immediately after launch, pls check Build and Test For PR / Samples Test failure links.