feat: reduce tmb reconcile

[zhiying-lin]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Reduce the traffic manager reconcile in order to reduce the arm calls

Which issue(s) this PR fixes:

Fixes #

Requirements:

• run make reviewable for basic local test
• Read and followed fleet-networking's Code of conduct.
• uses conventional commit messages
• includes documentation
• adds unit tests

How has this code been tested

Special notes for your reviewer

[codecov]

Codecov Report

Attention: Patch coverage is 45.39474% with 83 lines in your changes missing coverage. Please review.

Project coverage is 78.92%. Comparing base (ca0ca1a) to head (1ba5ff4).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...ontrollers/hub/trafficmanagerbackend/controller.go	45.39%	68 Missing and 15 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #320      +/-   ##
==========================================
- Coverage   80.22%   78.92%   -1.31%     
==========================================
  Files          29       29              
  Lines        4162     4246      +84     
==========================================
+ Hits         3339     3351      +12     
- Misses        653      715      +62     
- Partials      170      180      +10     

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