[DPE-6874] Check other units when getting the primary endpoint

[dragomirp]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 42.50000% with 23 lines in your changes missing coverage. Please review.

Project coverage is 71.98%. Comparing base (7686dd0) to head (0797b6e).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/cluster.py	51.72%	12 Missing and 2 partials ⚠️
src/charm.py	18.18%	6 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #808      +/-   ##
==========================================
- Coverage   72.08%   71.98%   -0.11%     
==========================================
  Files          15       15              
  Lines        3865     3869       +4     
  Branches      584      584              
==========================================
- Hits         2786     2785       -1     
- Misses        898      902       +4     
- Partials      181      182       +1     

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