Safe handling of control plane promises

[dagardner-nv]

Description

• Based on fixes from @mdemoret-nv : https://github.com/mdemoret-nv/MRC/tree/mdd_control-plane-promises

fixes #379

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Merging #380 (7a277cb) into branch-23.11 (9153243) will increase coverage by 0.07%.
The diff coverage is 88.73%.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-23.11     #380      +/-   ##
================================================
+ Coverage         73.11%   73.18%   +0.07%     
================================================
  Files               382      382              
  Lines             13403    13447      +44     
  Branches           1010     1013       +3     
================================================
+ Hits               9799     9841      +42     
- Misses             3604     3606       +2     

Flag	Coverage Δ
cpp	69.14% <88.73%> (+0.10%)	⬆️
py	41.95% <0.00%> (-0.11%)	⬇️

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Files Changed	Coverage Δ
cpp/mrc/src/internal/control_plane/client.hpp	69.69% <76.19%> (+0.73%)	⬆️
cpp/mrc/src/internal/control_plane/client.cpp	71.07% <88.00%> (+0.98%)	⬆️
cpp/mrc/src/internal/grpc/promise_handler.hpp	100.00% <100.00%> (ø)
cpp/mrc/src/internal/grpc/server.cpp	93.33% <100.00%> (+5.45%)	⬆️
cpp/mrc/src/tests/test_control_plane.cpp	100.00% <100.00%> (ø)

... and 4 files with indirect coverage changes

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