br: fix renaming pvc when there are multiple volumes in tikv pod (#4951)

[ti-chi-bot]

This is an automated cherry-pick of #4951

What problem does this PR solve?

Fix the bug that TiKV pods crash when execute EBS restore to restore TiKV with multiple volumes for the reason that we renamed pvc of TiKV by mistake.

Closes #4950

What is changed and how does it work?

The root cause is that we suppose there is only one volume in one TiKV when we sequence the pvc. When there are multiple volumes in one TiKV, the sequence of pvc will be disordered, which results in TiKV pods and restored pvc can't match.

So we group pvc of TiKV by volume name, we sequence pvc group by group.

Code changes

• Has Go code change
• Has CI related scripts change

Tests

• Unit test
• E2E test
• Manual test
• No code

Side effects

• Breaking backward compatibility
• Other side effects:

Related changes

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

Release Notes

Please refer to Release Notes Language Style Guide before writing the release note.

[ti-chi-bot]

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