Implement multi tenancy in Flow Framework

[dbwiddis]

Description

Uses the multitenant remote metadata client developed in ML Commons feature/multi_tenancy branch to migrate Flow Framework system indices to use the same pattern.

Draft - WIP

Submitting in logical steps to ease maintainer review. Suggestions:

1. To start, review each of the first several commits to understand how the tenant id is implemented and passed around
2. Then visit the tenant aware integ test classes to understand what it is we're trying to allow/prohibit

To use this locally, you will need to clone https://github.com/dbwiddis/opensearch-remote-metadata-sdk and run ./gradlew publishToMavenLocal. That is in the process of getting its own repo with publication to maven; this is a temporary workaround to keep the work unblocked.

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.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Attention: Patch coverage is 60.91772% with 247 lines in your changes missing coverage. Please review.

Project coverage is 76.45%. Comparing base (0284554) to head (1a9f856).

Files with missing lines	Patch %	Lines
...framework/indices/FlowFrameworkIndicesHandler.java	51.65%	68 Missing and 5 partials ⚠️
...ework/transport/CreateWorkflowTransportAction.java	66.36%	28 Missing and 9 partials ⚠️
.../opensearch/flowframework/util/EncryptorUtils.java	64.64%	26 Missing and 9 partials ⚠️
...ework/transport/DeleteWorkflowTransportAction.java	55.17%	10 Missing and 3 partials ⚠️
...h/flowframework/rest/RestCreateWorkflowAction.java	60.00%	6 Missing and 4 partials ⚠️
...flowframework/transport/handler/SearchHandler.java	62.50%	8 Missing and 1 partial ⚠️
.../opensearch/flowframework/FlowFrameworkPlugin.java	33.33%	7 Missing and 1 partial ⚠️
.../opensearch/flowframework/model/WorkflowState.java	57.89%	4 Missing and 4 partials ⚠️
.../org/opensearch/flowframework/util/ParseUtils.java	60.00%	5 Missing and 3 partials ⚠️
...owframework/rest/AbstractSearchWorkflowAction.java	50.00%	7 Missing ⚠️
... and 13 more

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #980      +/-   ##
============================================
- Coverage     77.57%   76.45%   -1.12%     
- Complexity      993     1011      +18     
============================================
  Files            99      101       +2     
  Lines          4714     4983     +269     
  Branches        431      472      +41     
============================================
+ Hits           3657     3810     +153     
- Misses          877      943      +66     
- Partials        180      230      +50     

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[dhrubo-os]

just curious why do we need to setup JDK again when are doing this at line 56?