[2.8] Reorder Setting enum to add Extension scope at bottom

[cwperks]

Description

Re-order the Setting enum to add Extension scope setting at the bottom. There was a break in extensions backward compatibility as extensions relies on the order of the enum when sending settings from node <-> extension.

I will open up a separate PR against main to backport to 2.x.

Related Issues

See more details: opensearch-project/opensearch-sdk-java#792

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
• Commit changes are listed out in CHANGELOG.md file (See: Changelog)

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[dbwiddis]

LGTM. Hard to test this without a BWC but the cause is well understood (transport from a 2.7 import sends an enum ordinal of 4 which is supposed to be NodeScope but wasn't).

[github-actions]

Gradle Check (Jenkins) Run Completed with:

• RESULT: UNSTABLE ❕
• TEST FAILURES:

      2 org.opensearch.search.SearchWeightedRoutingIT.testStrictWeightedRoutingWithCustomString

• URL: https://build.ci.opensearch.org/job/gradle-check/16678/
• CommitID: d6f0952
  Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.