Fix FsHealthServiceTests flaky tests

[RS146BIJAY]

Description

Fixing org.opensearch.monitor.fs.FsHealthServiceTests.testFailsHealthOnHungIOBeyondHealthyTimeout test: Increasing healthy time threshold. Ran the test 5000 times on local

Related Issues

#7557

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 b68772a

Incompatible components

Skipped components

Compatible components

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

[github-actions]

✅ Gradle check result for b68772a: SUCCESS

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b19e427) 71.34% compared to head (b68772a) 71.49%.
Report is 3 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #12366      +/-   ##
============================================
+ Coverage     71.34%   71.49%   +0.15%     
- Complexity    59771    59896     +125     
============================================
  Files          4960     4960              
  Lines        281164   281170       +6     
  Branches      40862    40864       +2     
============================================
+ Hits         200590   201019     +429     
+ Misses        63872    63477     -395     
+ Partials      16702    16674      -28     

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