Add keys only range test cases

[nwnt]

Breaking #21229 down. This PR makes all range test cases do --keys-only tests.

cc @serathius

[serathius]

Does this need to be anonymous function? Could we just move it to normal function?

[serathius]

Ditto for all other functions in the test.

[nwnt]

Done.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.44%. Comparing base (d89978e) to head (ec3114e).
⚠️ Report is 14 commits behind head on main.

Additional details and impacted files

see 27 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21247      +/-   ##
==========================================
+ Coverage   68.41%   68.44%   +0.03%     
==========================================
  Files         429      429              
  Lines       35288    35291       +3     
==========================================
+ Hits        24142    24155      +13     
  Misses       9751     9751              
+ Partials     1395     1385      -10     

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[serathius]

Please fix

../tests/common/kv_test.go:180:61: createHeader - offset always receives 7 (unparam)
func createHeader(firstHeader *etcdserverpb.ResponseHeader, offset int64) *etcdserverpb.ResponseHeader {

Personally I don't agree with this change, prefer explicit parameters for functions even it's used with same argument. You can disable unparam for this line

[nwnt]

Added no lint for the func now.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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Test name	Commit	Details	Required	Rerun command
pull-etcd-coverage-report	ec3114e	link	true	/test pull-etcd-coverage-report

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