[Backport 3.5] Fix Docker version extraction when prefixed with 'v' (on some systems / distributions)

[opensearch-trigger-bot]

Backport 628aa3d from #20670.

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❌ Gradle check result for 40952e5: FAILURE

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❌ Gradle check result for 40952e5: FAILURE

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❌ Gradle check result for 40952e5: FAILURE

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[github-actions]

❌ Gradle check result for 40952e5: FAILURE

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[github-actions]

❌ Gradle check result for 40952e5: FAILURE

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[github-actions]

❌ Gradle check result for 40952e5: FAILURE

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[github-actions]

❌ Gradle check result for 40952e5: FAILURE

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[github-actions]

❌ Gradle check result for 40952e5: FAILURE

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[github-actions]

✅ Gradle check result for 40952e5: SUCCESS

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (3.5@796f32f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
...opensearch/gradle/docker/DockerSupportService.java	0.00%	2 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##             3.5   #20672   +/-   ##
======================================
  Coverage       ?   73.16%           
  Complexity     ?    72012           
======================================
  Files          ?     5798           
  Lines          ?   329685           
  Branches       ?    47501           
======================================
  Hits           ?   241219           
  Misses         ?    69118           
  Partials       ?    19348           

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