[Feature Request] Update blob/main links to blob/[parent] after a PR is merged.

[clintandrewhall]

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It would be great to provide an option to automatically update any links in the description and comments that point to blob/main to the actual parent commit. When looking over an older PR, the links no longer point to the relevant, contextual file or location.

In my case, reviewing my investigation and comments in elastic/kibana#179311, the links don't lead me to the relevant code... I have to manually replace blob/main with the parent, or manually navigate around to the relevant file.

This could be done automatically, or the merge options could provide a checkbox. But I'd be surprised if anyone would want blob/main in a two-year-old PR where the files/lines likely no longer exist.