fix: HoldApplicationUntilProxyStarts feature.

[cybwan]

Description:
fix HoldApplicationUntilProxyStarts feature.

Testing done:
Done

Affected area:

Functional Area
New Functionality	[ ]
CI System	[ ]
CLI Tool	[ ]
Certificate Management	[ ]
Control Plane	[ ]
Demo	[ ]
Documentation	[ ]
Egress	[ ]
Ingress	[ ]
Install	[ ]
Networking	[ ]
Observability	[ ]
Performance	[ ]
SMI Policy	[ ]
Security	[ ]
Sidecar Injection	[ ]
Tests	[ ]
Upgrade	[ ]
Other	[X]

Please answer the following questions with yes/no.

1. Does this change contain code from or inspired by another project? no

2. Is this a breaking change? no

3. Has documentation corresponding to this change been updated in the fsm-docs repo (if applicable)? no

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Please upload report for BASE (release/v1.5@73241bd). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
pkg/messaging/broker.go	50.00%	2 Missing ⚠️

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Additional details and impacted files

@@               Coverage Diff               @@
##             release/v1.5     #575   +/-   ##
===============================================
  Coverage                ?   14.95%           
===============================================
  Files                   ?      841           
  Lines                   ?    62177           
  Branches                ?        0           
===============================================
  Hits                    ?     9297           
  Misses                  ?    52704           
  Partials                ?      176           

Flag	Coverage Δ
unittests	14.95% <50.00%> (?)

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[github-actions]

✅ PR Title Formatted Correctly

The title of this PR has been updated to match the correct format. Thank you!