test(bytes): add test for negative `start` index for `indexOfNeedle()`

[iuioiua]

Addresses https://github.com/denoland/deno_std/pull/4746#discussion_r1605477633

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 91.89%. Comparing base (377043c) to head (55a7257).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4768   +/-   ##
=======================================
  Coverage   91.89%   91.89%           
=======================================
  Files         485      485           
  Lines       41308    41308           
  Branches     5317     5317           
=======================================
  Hits        37959    37959           
  Misses       3292     3292           
  Partials       57       57           

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