chore: Deprecate Ruby 2.7 instrumentation

[duncanista]

What does this PR do?

Deprecates Ruby 2.7 instrumentation.

Motivation

Ruby 2.7 went in deprecation phase 2 as per AWS Lambda Runtime Deprecation Policy.

Testing Guidelines

n/a

Additional Notes

Types of changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (28a6b91) 76.33% compared to head (d72854a) 76.33%.

❗ Current head d72854a differs from pull request most recent head 0a65f85. Consider uploading reports for the commit 0a65f85 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #464   +/-   ##
=======================================
  Coverage   76.33%   76.33%           
=======================================
  Files          12       12           
  Lines         955      955           
  Branches      299      299           
=======================================
  Hits          729      729           
  Misses        164      164           
  Partials       62       62           

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