Adding configurable connection count setting for S3 Sync Client

[gbbafna]

Description

1. Add configurable S3 plugin's setting max_sync_connections for sync client's max connections.
2. Uses existing setting connection_acquisition_timeout for sync client as well . Today it is only used in async client.

Related Issues

Resolves #12027

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Failing checks are inspected and point to the corresponding known issue(s) (See: Troubleshooting Failing Builds)
• Commits are signed per the DCO using --signoff
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)
• Public documentation issue/PR created

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[github-actions]

Compatibility status:

Checks if related components are compatible with change 805b7f9

Incompatible components

Incompatible components: [https://github.com/opensearch-project/custom-codecs.git, https://github.com/opensearch-project/cross-cluster-replication.git, https://github.com/opensearch-project/performance-analyzer.git, https://github.com/opensearch-project/performance-analyzer-rca.git]

Skipped components

Compatible components

Compatible components: [https://github.com/opensearch-project/security-analytics.git, https://github.com/opensearch-project/observability.git, https://github.com/opensearch-project/notifications.git, https://github.com/opensearch-project/opensearch-oci-object-storage.git, https://github.com/opensearch-project/job-scheduler.git, https://github.com/opensearch-project/neural-search.git, https://github.com/opensearch-project/geospatial.git, https://github.com/opensearch-project/sql.git, https://github.com/opensearch-project/asynchronous-search.git, https://github.com/opensearch-project/ml-commons.git, https://github.com/opensearch-project/index-management.git, https://github.com/opensearch-project/anomaly-detection.git, https://github.com/opensearch-project/reporting.git, https://github.com/opensearch-project/security.git, https://github.com/opensearch-project/common-utils.git, https://github.com/opensearch-project/k-nn.git, https://github.com/opensearch-project/alerting.git]

[github-actions]

❕ Gradle check result for 15c47d5: UNSTABLE

• TEST FAILURES:

      1 org.opensearch.action.admin.cluster.node.tasks.ResourceAwareTasksTests.testTaskResourceTrackingDuringTaskCancellation

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (304042f) 71.37% compared to head (15c47d5) 71.48%.
Report is 15 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12022      +/-   ##
============================================
+ Coverage     71.37%   71.48%   +0.10%     
- Complexity    59403    59476      +73     
============================================
  Files          4923     4923              
  Lines        279214   279222       +8     
  Branches      40596    40596              
============================================
+ Hits         199302   199593     +291     
+ Misses        63375    63027     -348     
- Partials      16537    16602      +65     

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[github-actions]

❌ Gradle check result for 805b7f9: 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?