Overhaul latest_commit scripts for E2E, more logging and reduce GHA api calls

[dereknola]

Proposed Changes

Effectively the same as k3s-io/k3s#11148
Nightly E2E suite is seeing failures due to limits on GH api calls for the "latest commit". This PR attempts to address this in several ways:

• Allow E2E_RELEASE_VERSION=<commit_SHA> to install a specific commit SHA
• For the nightly test suite. run the latest_commit.sh script before all the tests, then pass that commit into each test (reduces API calls from I nodes x J tests to a single API call)
• Allow for an optional authenticated commits request via GH_TOKEN

Types of Changes

E2E, CI

Verification

Testing

Linked Issues

User-Facing Change

Further Comments

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 8.81%. Comparing base (6d26bc0) to head (f567249).
Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (6d26bc0) and HEAD (f567249). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (6d26bc0)	HEAD (f567249)
unittests	1	0

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #7427       +/-   ##
==========================================
- Coverage   23.23%   8.81%   -14.42%     
==========================================
  Files          33      33               
  Lines        3461    3461               
==========================================
- Hits          804     305      -499     
- Misses       2609    3133      +524     
+ Partials       48      23       -25     

Flag	Coverage Δ
inttests	8.81% <ø> (ø)
unittests	?

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