Gradle to 7.6.1 and Gradle test-retry to 1.5.2, updating dockerbuild PA Artifact pull logic

[khushbr]

Is your feature request related to a problem? Please provide an existing Issue # , or describe.
Backporting: 1. #357 and 2. #354

Addressing the build failure due to gradle version upgrade.

* What went wrong:
A problem was found with the configuration of task ':clonePaGitRepo' (type 'GitClone').
  - Type 'org.ajoberstar.gradle.git.tasks.GitClone' property 'authentication' is missing an input or output annotation.
    
    Reason: A property without annotation isn't considered during up-to-date checking.

Describe the solution you are proposing
Removing the redundant git clone and replacing with pulling Snapshots from Maven Snapshot repo(https://aws.oss.sonatype.org/content/repositories/snapshots). Refer: https://opensearch.org/blog/opensearch-plugin-zips-now-in-maven-repo/

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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]

Codecov Report

Merging #358 (f9e2c66) into 2.x (b7b9bc2) will decrease coverage by 0.01%.
The diff coverage is n/a.

❗ Current head f9e2c66 differs from pull request most recent head aad2950. Consider uploading reports for the commit aad2950 to get more accurate results

@@             Coverage Diff              @@
##                2.x     #358      +/-   ##
============================================
- Coverage     72.76%   72.75%   -0.01%     
+ Complexity     3045     3043       -2     
============================================
  Files           381      381              
  Lines         19013    19013              
  Branches       1472     1472              
============================================
- Hits          13834    13833       -1     
+ Misses         4584     4583       -1     
- Partials        595      597       +2     

see 3 files with indirect coverage changes