SOLR-17609: Remove HDFS module

[epugh]

https://issues.apache.org/jira/browse/SOLR-17609

Description

Explore what removing HDFS module from Solr impacts.

Solution

Searching for references for hdfs, hadoop, and other keywords. Running tests.

• Look at security policy last, once we get good green builds, what can we remove?
• Look at the Notice.txt, it refers to Apache Hadoop
• Look at libs.versions.toml

Tests

Only existing tests.

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

[epugh]

Question! Should AbstractRecoveryZkTestBase be merged back into RecoveryZkTest since we no longer have the HDFS contrib tests? That goes for AbstractChaosMonkeySafeLeaderTestBase, AbstractMoveReplicaTestBase,AbstractRecoveryZkTestBase, AbstractRestartWhileUpdatingTestBase, AbstractSyncSliceTestBase, AbstractTlogReplayBufferedWhileIndexingTestBase, AbstractUnloadDistributedZkTestBase files as well?

[epugh]

Opportunity to remove the isSharedStorage property of DirectoryFactory?

[epugh]

I think this is ready for review! I don't plan on merging it till we get some more consensus.

One thing I need eyes on: the security.policy. I was able to confirm my changes to solr-tests.policy by removing properties one by one and running the test suite, but can't do that for security.policy.. I will do some manual testing.