chore: reconcile lambda runtime support

[ava-silver]

What does this PR do?

Stops accepting java8, nodejs12.x, nodejs14.x, nodejs16.x, python2.7, python3.6, and python3.7 as supported tracer runtimes. They now follow the macro's existing unsupported-runtime path, while supported neighboring runtimes remain unchanged.

Motivation

The macro's customer-visible runtime support must match the APM Serverless-approved Lambda runtime catalog before runtime campaigns begin.

Testing Guidelines

Not tested manually.

Additional Notes

This PR is stacked on the format-preparation PR, #269. It does not add generated tracer or Extension defaults.

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

[ava-silver]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• chore: reconcile lambda runtime support #270 👈 (View in Graphite)
• chore: prepare lambda layer catalog #269
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.62%. Comparing base (2eac29c) to head (884e2bd).

Additional details and impacted files

@@                                Coverage Diff                                @@
##           ava.silver/chore/prepare-lambda-layer-catalog     #270      +/-   ##
=================================================================================
- Coverage                                          86.83%   86.62%   -0.22%     
=================================================================================
  Files                                                 19       19              
  Lines                                               1762     1734      -28     
  Branches                                             352      352              
=================================================================================
- Hits                                                1530     1502      -28     
  Misses                                               231      231              
  Partials                                               1        1              

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