Add release-layer-and-github workflow (no SDK publish) and remove me-…

[viw-test1]

…south-1

Issue #, if available:

Description of changes:

1. Remove me-south-1 from the default Lambda layer deployment regions in release-build.yml as the region is no longer operational.

2. Add release-layer-and-github.yml — a new workflow identical to release-build.yml but without the publish-sdk job (no Docker image push to ECR, no Maven Central publish, no GPG signing). This allows re-running the Lambda layer publish and GitHub release creation independently when the SDK has already been published.

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 69.39%. Comparing base (09e6487) to head (418cf1a).
⚠️ Report is 565 commits behind head on main.
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Additional details and impacted files

@@              Coverage Diff              @@
##               main    #1369       +/-   ##
=============================================
- Coverage     85.71%   69.39%   -16.33%     
- Complexity       19      704      +685     
=============================================
  Files             3       63       +60     
  Lines            49     3437     +3388     
  Branches          5      487      +482     
=============================================
+ Hits             42     2385     +2343     
- Misses            3      861      +858     
- Partials          4      191      +187     

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