Perform peer sampling before initiating replication requests

[sandreae]

Take a random sample of the available peers in the replication service and only initiate replication sessions with them.

📋 Checklist

• Add tests that cover your changes
• Add this PR to the Unreleased section in CHANGELOG.md
• Link this PR to any issues it closes
• New files contain a SPDX license header

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.02% ⚠️

Comparison is base (ecc2955) 91.84% compared to head (dfc6899) 91.83%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #463      +/-   ##
==========================================
- Coverage   91.84%   91.83%   -0.02%     
==========================================
  Files         100      100              
  Lines       15731    15733       +2     
==========================================
  Hits        14448    14448              
- Misses       1283     1285       +2     

Files Changed	Coverage Δ
aquadoggo/src/replication/service.rs	75.21% <100.00%> (+0.21%)	⬆️

... and 1 file with indirect coverage changes

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