chore: Remove unused nightly test runs script and task

[mattcreaser]

• PR title and description conform to Pull Request guidelines.

Issue #, if available:

Description of changes:
Removes the runNightlyTestsInDeviceFarmPool task and script as it was unused

How did you test these changes?
(Please add a line here how the changes were tested)

Documentation update required?

• No
• Yes (Please include a PR link for the documentation update)

General Checklist

• Added Unit Tests
• Added Integration Tests
• Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• Ensure commit message has the appropriate scope (e.g fix(storage): message, feat(auth): message, chore(all): message)

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 54.53%. Comparing base (9c96c87) to head (1a4241e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3147      +/-   ##
==========================================
- Coverage   54.53%   54.53%   -0.01%     
==========================================
  Files        1044     1044              
  Lines       31259    31259              
  Branches     4695     4695              
==========================================
- Hits        17047    17046       -1     
  Misses      12380    12380              
- Partials     1832     1833       +1     

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