Merge pull request #50593 from CaoShuFeng/underscore
Automatic merge from submit-queue (batch tested with PRs 50094, 48966, 49478, 50593, 49140)
some small fix in verify-flags-underscore
1. exceptions.txt and known-flags.txt are deleted, remove them from
code too.
2. remove some duplicated flags from excluded-flags.txt
**Release note**:
```
NONE
```
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