[Refactor] Strings methods other than MediaType

[nknize]

This refactors all of the remaining utility methods (except those that convert MediaType and XContentBuilder to String) from the :server to :libs:opensearch-core library. This commit is to keep the Strings refactor surface area lean in preparation for cloud native and serverless refactoring.

relates #5910
relates #8110

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/21915/
• CommitID: d9deacc

[codecov]

Codecov Report

Merging #9126 (b40332f) into main (5bb7fa3) will decrease coverage by 0.01%.
The diff coverage is 67.60%.

❗ Current head b40332f differs from pull request most recent head dc4f3db. Consider uploading reports for the commit dc4f3db to get more accurate results

@@             Coverage Diff              @@
##               main    #9126      +/-   ##
============================================
- Coverage     71.02%   71.01%   -0.01%     
+ Complexity    57286    57263      -23     
============================================
  Files          4765     4765              
  Lines        270398   270397       -1     
  Branches      39546    39546              
============================================
- Hits         192045   192035      -10     
- Misses        62191    62218      +27     
+ Partials      16162    16144      -18     

Files Changed	Coverage Δ
...luster/snapshots/create/CreateSnapshotRequest.java	69.93% <ø> (-1.23%)	⬇️
...cluster/metadata/MetadataIndexTemplateService.java	81.80% <0.00%> (ø)
...r/src/main/java/org/opensearch/common/Strings.java	66.66% <ø> (-4.77%)	⬇️
...pensearch/common/settings/PropertyPlaceholder.java	92.45% <ø> (ø)
...apshots/blobstore/BlobStoreIndexShardSnapshot.java	73.05% <ø> (-0.52%)	⬇️
...ch/repositories/blobstore/BlobStoreRepository.java	61.58% <ø> (+0.21%)	⬆️
...ava/org/opensearch/snapshots/SnapshotsService.java	47.55% <33.33%> (-2.29%)	⬇️
.../main/java/org/opensearch/core/common/Strings.java	66.32% <68.75%> (+1.75%)	⬆️
...h/cluster/metadata/MetadataCreateIndexService.java	79.01% <100.00%> (-0.37%)	⬇️
...g/opensearch/repositories/RepositoriesService.java	72.24% <100.00%> (ø)

... and 460 files with indirect coverage changes

[opensearch-trigger-bot]

Compatibility status:

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

BUILD SUCCESSFUL in 37m 55s

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: SUCCESS ✅
• URL: https://build.ci.opensearch.org/job/gradle-check/21918/
• CommitID: b40332f

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/21919/
• CommitID: dc4f3db
  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 (Jenkins) Run Completed with:

• RESULT: FAILURE ❌
• URL: https://build.ci.opensearch.org/job/gradle-check/21922/
• CommitID: dc4f3db
  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?

[nknize]

Another unrelated fail:

./gradlew ':server:internalClusterTest' --tests "org.opensearch.remotestore.ReplicaToPrimaryPromotionIT.testFailoverWhileIndexing" -Dtests.seed=F2F6C4BC55C5DA92 -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=ru-RU -Dtests.timezone=Europe/Podgorica -Druntime.java=20

Merging.