Reduce the number of GH api request for E2E nightly

[dereknola]

Proposed Changes

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

Running on the nightly nodes by hand.

Testing

Linked Issues

User-Facing Change

Further Comments

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 41.99%. Comparing base (8ce04d3) to head (af4b3dc).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11148      +/-   ##
==========================================
- Coverage   46.77%   41.99%   -4.78%     
==========================================
  Files         178      178              
  Lines       18498    18498              
==========================================
- Hits         8652     7769     -883     
- Misses       8496     9525    +1029     
+ Partials     1350     1204     -146     

Flag	Coverage Δ
e2etests	34.20% <ø> (-8.01%)	⬇️
inttests	34.58% <ø> (+15.92%)	⬆️
unittests	13.11% <ø> (ø)

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