remove removeDropedPullRequestOpaque and deleteOpaqueForDropPullRequest.

[ifplusor]

What is the purpose of the change

clean up.

Brief changelog

remove removeDropedPullRequestOpaque and deleteOpaqueForDropPullRequest.

Verifying this change

XXXX

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[jonnxu]

i suggest reserve this two logs

[jonnxu]

LMGT