RFR: SKARA-1096: New command and label for JEPs, similar to CSR [v5]

[Guoxiong Li]

On Fri, 15 Apr 2022 12:51:52 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> At least in the jep command case, removing before posting comment is fine. I don't think we should add a dead parameter at this time. This can easily be extended if we ever find a need for it.
>
> Hm, at second thought, I take that back. Removing it after adding a new comment is better.

I updated the code just now. The new code changes the PR labels after commenting just as we discussed before.

And I refactored the method `processCommand` to avoid the multi-level nested conditional statements.

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PR: https://git.openjdk.java.net/skara/pull/1297