tiup-cluster: support clearing extra data dirs automatically when destroying cluster.

[LykxSassinator]

What problem does this PR solve?

For example, if using the following configs:

global_configs:
  data-dir: /tikv/data

server_configs:
  tikv:
    raft-engine.dir: "/data1/raft"
    raft-engine.spill-dir: "/data1/spill"

The default data directory is set to use /tikv/data as the root path, while raft logs are stored in a distinct location at /data1/raft. However, this configuration results in the tiup-cluster destroy command failing to remove the raft logs as intended, leading to a leak of raft data that should be cleared.

This pr is introduced to make tiup-cluster clear extra data directories if specified.

What is changed and how it works?

Two parts:

• Records the extra directories by getExtraDeployDirs and inserts them into Instance.Dirs when init.
• Clear them when destroying TiKV instances.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has exported function/method change
• Has exported variable/fields change
• Has interface methods change
• Has persistent data change

Side effects

• Possible performance regression
• Increased code complexity
• Breaking backward compatibility

Related changes

• Need to cherry-pick to the release branch
• Need to update the documentation

Release notes:

NONE

[CLAassistant]

All committers have signed the CLA.

[ti-chi-bot[bot]]

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[ti-chi-bot[bot]]

Welcome @LykxSassinator! It looks like this is your first PR to pingcap/tiup 🎉