Make ActionRequests that extend UpdateRequest to extend more generic ActionRequest

[cwperks]

Description

WIP to fix errors seen in CI with security checks.

See more details on opensearch-project/security#4937

Related Issues

Resolves #1281

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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[cwperks]

Adding changes from #1310

[cwperks]

The changes in this file are needed to adapt to a bugfix in core: https://github.com/opensearch-project/OpenSearch/pull/16568/files#diff-4294469155ee17976f9046a05d7fb983ddce7d8398f780b7e60c17065e521f4f

Core allows the readonly settings to change in an update request if and only if its the only setting being changed.

There used to be a bug in core that allowed changes of multiple settings because the conditional did not group the settings together in the same group (i.e. condition1 && condition2 || condition3 || condition4 instead of condition1 && (condition2 || condition3 || condition4))

if (request.settings().size() == 1 &&  // we have to allow resetting these settings otherwise users can't unblock an index
  IndexMetadata.INDEX_BLOCKS_METADATA_SETTING.exists(request.settings())
  || IndexMetadata.INDEX_READ_ONLY_SETTING.exists(request.settings())
  || IndexMetadata.INDEX_BLOCKS_READ_ONLY_ALLOW_DELETE_SETTING.exists(request.settings())) { ... }

To adapt to the change, this is now setting readonly to false initially and then doing a follow-up request to set it back to true and auto-manage to false.

[cwperks]

@vikasvb90 @bowenlan-amzn @tandonks All checks are passing now that the 2.x build was fixed in #1315