AMQP: Stop connection retry loop on shutdown to avoid RejectedExecutionException

[ozangunalp]

Close ConnectionHolder before closing the AMQP client during shutdown, preventing the memoized connection Uni from retrying on a terminated Vert.x event loop.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.87%. Comparing base (a96442f) to head (0134e7e).
⚠️ Report is 1225 commits behind head on main.

Files with missing lines	Patch %	Lines
...lrye/reactive/messaging/amqp/ConnectionHolder.java	86.66%	3 Missing and 3 partials ⚠️
...lrye/reactive/messaging/amqp/AmqpClientHolder.java	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3491      +/-   ##
============================================
+ Coverage     77.47%   77.87%   +0.40%     
- Complexity     3778     5624    +1846     
============================================
  Files           306      485     +179     
  Lines         12673    18787    +6114     
  Branches       1648     2313     +665     
============================================
+ Hits           9818    14631    +4813     
- Misses         2116     3014     +898     
- Partials        739     1142     +403     

Files with missing lines	Coverage Δ
...mallrye/reactive/messaging/amqp/AmqpConnector.java	82.50% <100.00%> (+1.87%)	⬆️
...lrye/reactive/messaging/amqp/AmqpClientHolder.java	92.30% <66.66%> (ø)
...lrye/reactive/messaging/amqp/ConnectionHolder.java	87.09% <86.66%> (+19.52%)	⬆️

... and 284 files with indirect coverage changes

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