Add nightly dependency bump workflow

[ezhang6811]

Issue #, if available:

Description of changes:
Add a workflow nightly-build.yml with following actions:

• creates or checks out existing nightly-dependency-updates branch
• checks for newest versions of dependencies in opentelemetry-java-instrumentation and opentelemetry-java-contrib and bumps versions if applicable
• search for releases with breaking changes in release notes
• runs main build checks on the branch, publishes a failure metric based on the outcome.
• creates a PR with the build result and breaking changes.

Example nightly build run: https://github.com/aws-observability/aws-otel-java-instrumentation/actions/runs/19274561891
PR: #1260

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

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.28%. Comparing base (09e6487) to head (73df7fb).
⚠️ Report is 520 commits behind head on main.
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Additional details and impacted files

@@              Coverage Diff              @@
##               main    #1219       +/-   ##
=============================================
- Coverage     85.71%   67.28%   -18.43%     
- Complexity       19      525      +506     
=============================================
  Files             3       54       +51     
  Lines            49     2693     +2644     
  Branches          5      373      +368     
=============================================
+ Hits             42     1812     +1770     
- Misses            3      746      +743     
- Partials          4      135      +131     

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[thpierce]

Only reviewed .github/workflows

[thpierce]

Remove