[E2E] Check the last 10 commits for upgrade E2E test

[dereknola]

Proposed Changes

• Check the last 10 commits on a branch when looking for a valid aws commit build. When code freeze comes up, the number of PRs merged causes long build queues, meaning that the last 5 commits may not be available for E2E testing.
• Rework script to use bash array rather than edit a file one line at a time

Types of Changes

E2E

Verification

Testing

Linked Issues

N/A internal improvement

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.26%. Comparing base (1ae9ca7) to head (d029b54).
Report is 13 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11086      +/-   ##
==========================================
- Coverage   49.83%   43.26%   -6.58%     
==========================================
  Files         178      178              
  Lines       14816    14764      -52     
==========================================
- Hits         7384     6387     -997     
- Misses       6082     7178    +1096     
+ Partials     1350     1199     -151     

Flag	Coverage Δ
e2etests	34.46% <ø> (-11.53%)	⬇️
inttests	36.69% <ø> (+0.08%)	⬆️
unittests	13.59% <ø> (+0.04%)	⬆️

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