[BUG] oss.gg allows self assignment under PRs

[Pushan2005]

Issue Summary

the / assign command allows people to assign a PR to themselves

Steps to Reproduce

try the / assign command in the comments under a PR

Expected behavior

the command should only assign issues

Other information

No response

Screenshots

No response

Desktop (please complete the following information)

- OS:
- Node:
- npm:

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[nakul-py]

/assign

[nakul-py]

this issue is solved #138