RFR: 1727: Ability to control whether clean backports require review [v3]

[Zhao Song]

> In this patch, PR bot has been added with the capability to control the requirement of reviews for clean backports. 
> 
> By default, no review is necessary for clean backports. 
> 
> However, if it is desired to enable the requirement of reviews for backports in a repo, the configuration can be added to the PR bot configuration as follows:
> 
> {
>   "pr": {
>       "repositories": {
>           "repo1": {
>                "requiresReviewForBackport": true
>           }
>        }
>   }
> }

Zhao Song has updated the pull request incrementally with one additional commit since the last revision:

  Update bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java
  
  Co-authored-by: Erik Joelsson <37597443+erikj79 at users.noreply.github.com>

-------------

Changes:
  - all: https://git.openjdk.org/skara/pull/1457/files
  - new: https://git.openjdk.org/skara/pull/1457/files/8f1719ef..1b5ca328

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1457&range=02
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1457&range=01-02

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/skara/pull/1457.diff
  Fetch: git fetch https://git.openjdk.org/skara pull/1457/head:pull/1457

PR: https://git.openjdk.org/skara/pull/1457