RFR: 1271: Webrev generation should be optional [v4]

[Zhao Song]

On Tue, 21 Feb 2023 19:31:40 GMT, Zhao Song <zsong at openjdk.org> wrote:

>> Currently, webrevs are generated automatically when a user pushes a new commit, and it's mandatory to choose either JSON or HTML when configuring the mlbridge bot. If both of them are disabled in the configuration, the bot will throw errors.
>> 
>> In this patch, generating a webrev will be optional. If both JSON and HTML are disabled, no webrev will be generated.
>
> Zhao Song has updated the pull request incrementally with one additional commit since the last revision:
> 
>   skip generating paths in WebrevStorage#createAndArchive

Thanks for the review!

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