Add ap-east-2 and ap-southeast-6 to release build default regions

[viw-test1]

Issue #, if available:

Description of changes:
Add 2 new region to the build release

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

[github-actions]

Claude Code Review - PR #1367

Overall Assessment: No bugs or security issues found.

This PR adds two new AWS regions (ap-east-2 and ap-southeast-6) to the aws_region default input for the release build workflow. The changes are correctly placed:

• ap-east-2 is inserted after ap-east-1
• ap-southeast-6 is inserted after ap-southeast-4

The LEGACY_COMMERCIAL_REGIONS env var is correctly left unchanged, as these new regions should use the per-region role ARN pattern rather than the shared legacy role.

LGTM.

[codecov-commenter]

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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 (7b6806b).
⚠️ Report is 566 commits behind head on main.
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Additional details and impacted files

@@              Coverage Diff              @@
##               main    #1367       +/-   ##
=============================================
- 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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