Delete PR comments when additional commit resolved security issue

[oke-py]

What would you like to be added: Action triggered by PR creates a comment if npm audit found vulnerabilities. When additional commit resolves the problem, the comment should be removed. It's similar to the prow behavior.

Why is this needed: Remaining comments might be misleading.

[Splaktar]

It might be nicer to update the comment to make it expandable (collapsed) and add a line outside of that which states that the vulnerabilities have been addressed (optionally with a link to the commit that solved them).