Automatic merge from submit-queue (batch tested with PRs 50537, 49699, 50160, 49025, 50205)

AddOrUpdateTaint should ignore duplicate Taint.

The parameter of AddOrUpdateTaint is Taint pointer, so should use
Taint object itself to compare with the node's taint list to ignore
duplicate taint.

While doing #49384, found this issue and fixed.

Fixed part of #49384, other test cases will be added in the following patch

**Release note**:
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