Update gradle to 8.1.1

[bowenlan-amzn]

Issue #, if available:

Description of changes:

• Use com.netflix.nebula.ospackage now to be in consistent with core
• Remove 2 migration services (template, metadata), since breaking change is acceptable for 3.0, user should first upgrade to 2.x before upgrading to 3.0, these migration services are not useful anymore.
• Fix deprecations
• Fix flaky test test history shard settings

CheckList:

• 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.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov-commenter]

Codecov Report

Merging #771 (354d20c) into main (76272ee) will increase coverage by 0.11%.
The diff coverage is 36.36%.

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@@             Coverage Diff              @@
##               main     #771      +/-   ##
============================================
+ Coverage     75.35%   75.47%   +0.11%     
+ Complexity     2673     2588      -85     
============================================
  Files           337      335       -2     
  Lines         15562    15174     -388     
  Branches       2286     2189      -97     
============================================
- Hits          11727    11452     -275     
+ Misses         2496     2447      -49     
+ Partials       1339     1275      -64     

Impacted Files	Coverage Δ
...nt/indexstatemanagement/ManagedIndexCoordinator.kt	70.42% <ø> (+0.19%)	⬆️
...atemanagement/step/shrink/AttemptMoveShardsStep.kt	57.70% <0.00%> (ø)
...atemanagement/step/shrink/WaitForMoveShardsStep.kt	45.45% <0.00%> (-3.78%)	⬇️
...exstatemanagement/step/shrink/WaitForShrinkStep.kt	40.00% <0.00%> (-2.00%)	⬇️
...adata/TransportUpdateManagedIndexMetaDataAction.kt	75.86% <ø> (-10.35%)	⬇️
...tion/mapping/TransportUpdateRollupMappingAction.kt	65.00% <ø> (ø)
.../rollup/util/RollupFieldValueExpressionResolver.kt	61.53% <0.00%> (ø)
.../org/opensearch/indexmanagement/util/IndexUtils.kt	76.41% <0.00%> (+0.94%)	⬆️
...arch/indexmanagement/rollup/RollupMapperService.kt	58.58% <50.00%> (ø)
...ndexstatemanagement/IndexStateManagementHistory.kt	78.08% <66.66%> (+0.84%)	⬆️
... and 4 more

... and 30 files with indirect coverage changes

[yuye-aws]

I have submitted another pull request to fix the similar build failure problem on 2.x branch. Two reviewers are required to approve my pull request but there is no code reviewer assigned yet. Could you help review my code? Thanks!