SOLR-6122: POC cancel submitted not started async task

[QFREEE]

https://issues.apache.org/jira/browse/SOLR-6122

Description

Cancel submitted but not started collections api call

Solution

The code provided only applies to non distributed overseer mode for now.

Add a force query param to deleteStatus to allow it remove submitted but not started tasks.

When force == true, will remove submitted task from collection-queue-work and asyncid map.

In overseerTaskProceser, there will be a risk that even if task is removed from collection-queue-work, task could still remain in in-memory blockedTask, thus still be excuted. We check if the async id is present in async id before excuting to try to mitigate it

Tests

Please describe the tests you've developed or run to confirm this patch implements the feature or solves the problem.

Checklist

Please review the following and check all that apply:

• I have reviewed the guidelines for How to Contribute and my code conforms to the standards described there to the best of my ability.
• I have created a Jira issue and added the issue ID to my pull request title.
• I have given Solr maintainers access to contribute to my PR branch. (optional but recommended, not available for branches on forks living under an organisation)
• I have developed this patch against the main branch.
• I have run ./gradlew check.
• I have added tests for my changes.
• I have added documentation for the Reference Guide

[dsmiley]

I'll give it a look when you think it's ready (I see it's Draft). Two checks fail.