fix: each router handle stores the entire connections map

[Sidddddarth]

Description

Each router handle stored the connections for all destinations, even those of which were not of the same destType!
It's now filtered so router handles only store connection details of destinations of the same destType.

Linear Ticket

Resolves PIPE-1540

Security

• The code changed/added as part of this pull request won't create any security issues with how the software is being used.

[mihir20]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.77%. Comparing base (0ada31f) to head (50f1ce7).
Report is 1 commits behind head on release/1.34.x.

Additional details and impacted files

@@                Coverage Diff                 @@
##           release/1.34.x    #5109      +/-   ##
==================================================
- Coverage           74.80%   74.77%   -0.03%     
==================================================
  Files                 435      435              
  Lines               50436    50438       +2     
==================================================
- Hits                37728    37716      -12     
+ Misses              10241    10237       -4     
- Partials             2467     2485      +18     

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