Remove flag --max-snapshots and --v2-deprecation

[ahrtr]

part of #20187

The v2store is completely gone, so remove both flag --max-snapshots and --v2-deprecation.

[ahrtr]

/retest

cc @fuweid @ivanvc @serathius

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.67%. Comparing base (7b2ad21) to head (9dbb2d9).

Additional details and impacted files

Files with missing lines	Coverage Δ
server/config/config.go	80.23% <ø> (ø)
server/embed/config.go	79.56% <100.00%> (+0.09%)	⬆️
server/embed/etcd.go	75.73% <ø> (-0.17%)	⬇️
server/etcdmain/config.go	69.82% <ø> (-3.66%)	⬇️
server/etcdserver/server.go	83.68% <100.00%> (-0.09%)	⬇️

... and 13 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #22306      +/-   ##
==========================================
+ Coverage   69.64%   69.67%   +0.02%     
==========================================
  Files         449      448       -1     
  Lines       38196    38155      -41     
==========================================
- Hits        26602    26584      -18     
+ Misses      10163    10147      -16     
+ Partials     1431     1424       -7     

---

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[kubernetes-prow]

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