Extract methods for accessing EtcdState fields

[serathius]

Extracted from #21486

/cc @nwnt @henrybear327

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.13%. Comparing base (93f54ae) to head (5b913af).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

see 38 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21597      +/-   ##
==========================================
- Coverage   68.28%   68.13%   -0.15%     
==========================================
  Files         429      426       -3     
  Lines       35389    35254     -135     
==========================================
- Hits        24165    24020     -145     
+ Misses       9814     9802      -12     
- Partials     1410     1432      +22     

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: henrybear327, serathius

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