Endpoint port validation in GrpcTransport

[fmsprog]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.12%. Comparing base (d653031) to head (106084f).

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #540      +/-   ##
============================================
+ Coverage     62.06%   62.12%   +0.05%     
- Complexity     2365     2371       +6     
============================================
  Files           331      331              
  Lines         13750    13753       +3     
  Branches       1379     1380       +1     
============================================
+ Hits           8534     8544      +10     
+ Misses         4568     4564       -4     
+ Partials        648      645       -3     

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