add RangeStream test for values exceeding chunk target

[Jefftree]

Could be an edge case where we have 4MB values or something. Ensure that RangeStream still progresses despite each chunk exceeding the preconfigured 1.5MB chunk limit.

[k8s-ci-robot]

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[Jefftree]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.27%. Comparing base (b2a2cbb) to head (c5d1b8a).
⚠️ Report is 46 commits behind head on main.

Additional details and impacted files

see 42 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #21746      +/-   ##
==========================================
- Coverage   70.28%   70.27%   -0.02%     
==========================================
  Files         425      426       +1     
  Lines       35145    35212      +67     
==========================================
+ Hits        24703    24746      +43     
- Misses       9047     9073      +26     
+ Partials     1395     1393       -2     

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[Jefftree]

/retest

[Jefftree]

/retest

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fuweid, Jefftree, serathius

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