Fix issue with updating core with a patch number other than 0

[cwperks]

Description

While researching opensearch-project/opensearch-build#5720, I ran into an issue where I could not version bump the core to 3.3.1 and run ./gradlew localDistro successfully. It would run into the following error:

* What went wrong:
An exception occurred applying plugin request [id: 'opensearch.global-build-info']
> Failed to apply plugin 'opensearch.global-build-info'.
   > Expected exactly 2 majors in parsed versions but found: [2, 3, 6, 7]

The reason for this is that it hit this block which is only triggered when the minor and patch version are both non-zero. When the patch number is 0 (as it is with any minor version bump) then the condition never gets triggered.

This PR resolves the issue by removing references to the Legacy ES version numbers which are more than 2 major versions in the past at this point.

Related Issues

Related to opensearch-project/opensearch-build#5720

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[github-actions]

✅ Gradle check result for be0a4b5: SUCCESS

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 72.94%. Comparing base (a132bb5) to head (891235b).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
.../opensearch/gradle/info/GlobalBuildInfoPlugin.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #19377      +/-   ##
============================================
+ Coverage     72.81%   72.94%   +0.13%     
- Complexity    69838    69849      +11     
============================================
  Files          5674     5674              
  Lines        320850   320861      +11     
  Branches      46383    46386       +3     
============================================
+ Hits         233624   234058     +434     
+ Misses        68361    67869     -492     
- Partials      18865    18934      +69     

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[github-actions]

❌ Gradle check result for 891235b: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❕ Gradle check result for 891235b: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[sandeshkr419]

LGTM - time to rebase from main I guess!