RFR: 1271: Webrev generation should be optional

[Erik Joelsson]

On Thu, 16 Feb 2023 22:56:15 GMT, Zhao Song <zsong at openjdk.org> wrote:

> > I believe it's the logic that parses email from the email list server and extracts the PR URL from the verify first email in the each thread. You are likely safe here as you aren't changing the line that contains the PR URL, but better be safe.
> 
> The logic you mentioned seems like has been deleted in SKARA-386. So I think we are safe.

The logic I was thinking about is in `MailingListArchiveReaderBot` `PULL_REQUEST_LINK_PATTERN`.

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PR: https://git.openjdk.org/skara/pull/1475