fix version.gradle.kts logic

[ezhang6811]

Issue #, if available:

Description of changes:
cherry-picks commit from #1255, see for more details.

Do not touch the version variable in environments where -Prelease.version is passed in. This prevents a versioning conflict in closeAndReleaseSonatypeStagingRepository, an error which was only thrown when releasing.

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 (f263868).
⚠️ Report is 519 commits behind head on main.
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Additional details and impacted files

@@              Coverage Diff              @@
##               main    #1256       +/-   ##
=============================================
- 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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