refactor(hcops): cleanup AllServersCache

[apricote]

This separates accessing the cache from loading the data and renames some identifiers to better represent their purpose.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 75.86207% with 7 lines in your changes missing coverage. Please review.

Project coverage is 71.81%. Comparing base (8656812) to head (2b769bb).

Files	Patch %	Lines
internal/hcops/server.go	75.86%	6 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #674      +/-   ##
==========================================
- Coverage   71.89%   71.81%   -0.08%     
==========================================
  Files          32       32              
  Lines        2658     2672      +14     
==========================================
+ Hits         1911     1919       +8     
- Misses        556      561       +5     
- Partials      191      192       +1     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.