Add range test with header

[nwnt]

Breaking #21025 to smaller chunks. This PR adds a new test function, setting up the etcd with PUTs and asserting the expected results with two basic test cases:

• GET a single key without any options
• GET a single key with serializable options.

@serathius

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.46%. Comparing base (28bed68) to head (11dcfb2).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

see 18 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21152      +/-   ##
==========================================
+ Coverage   68.36%   68.46%   +0.10%     
==========================================
  Files         429      429              
  Lines       35267    35267              
==========================================
+ Hits        24110    24146      +36     
+ Misses       9763     9731      -32     
+ Partials     1394     1390       -4     

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[serathius]

Having separate Test will not make removal of the original test easier to review

[serathius]

One way to split PR is to extract response validation but not change test cases, for example main...serathius:etcd:test-range-response

[nwnt]

/retest