RFR: Refactoring in preparation for SKARA-1146 [v2]

[Kevin Rushforth]

On Thu, 6 Jan 2022 22:14:54 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

>> While working on SKARA-1146, I felt that I needed to do some refactoring. To ease the review process, I've separated those changes into a separate PR. Nothing should change functionally from this change. Here is what I've done:
>> 
>> * Created String constants for the special custom fields we have in JBS.
>> * In IssueNotifier, created a method for finding the fixVersion for a branch. This code block is actually copied and sprinkled all over the code base, but for now, I will just unify the copies in the same class.
>
> Erik Joelsson has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Rename variable
>  - Remove unwanted change

Marked as reviewed by kcr (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1270