[HUDI-3007] Fix issues in HoodieRepairTool

[yihua]

What is the purpose of the pull request

This PR fixes a few issues in HoodieRepairTool and adds unit and functional tests to guarantee the functionality of the repair utility.

Brief change log

• Fixes the file listing for backup path in UNDO mode to get the correct list of files to restore.
• Uses HoodieEngineContext instance to generalize parallelized operations instead of hardcoding JavaSparkContext and spark logic.
• Fixes serialization issues in deleteFiles().
• Adds return status for various operations to check whether an operation is successful.

Verify this pull request

This change adds new tests:

• Adds unit and functional tests in TestRepairUtil, TestHoodieRepairTool, and TestFSUtils.
• Manually verifies the change by running a spark job with HoodieRepairTool locally.

Committer checklist

• Has a corresponding JIRA in PR title & commit

• Commit message is descriptive of the change

• CI is green

• Necessary doc changes done or have another open PR

• For large changes, please consider breaking it into sub-tasks under an umbrella JIRA.

[nsivabalan]

Few minor comments. I will merge this in and pull it into 0.10.1. You can address any feedback in a follow up patch.

[nsivabalan]

@yihua : looks like there are some test failures in Repair tool tests. Can you check them out please.

[hudi-bot]

CI report:

• 3369d96 Azure: SUCCESS

Bot commands

@hudi-bot supports the following commands:

• @hudi-bot run azure re-run the last Azure build

[yihua]

@yihua : looks like there are some test failures in Repair tool tests. Can you check them out please.

It's all good now. I'm going to merge the PR.