refactor: add try catch to reviewer

[alicelovescake]

This PR:

• Adds a try catch block so we can log the error and not stop the process if requestReviewer fails

[dsanders11]

I think the changes to tests should mostly be backed out and put in a new spec/utils.spec.ts which tests tagBackportReviewers directly. The changes to spec/operations.spec.ts get too into the implementation details of tagBackportReviewers, it was better when it was checking just if tagBackportReviewers was called, and we can put testing of error handling inside tagBackportReviewers in the spec/utils.spec.ts file.

[alicelovescake]

I think the changes to tests should mostly be backed out and put in a new spec/utils.spec.ts which tests tagBackportReviewers directly. The changes to spec/operations.spec.ts get too into the implementation details of tagBackportReviewers, it was better when it was checking just if tagBackportReviewers was called, and we can put testing of error handling inside tagBackportReviewers in the spec/utils.spec.ts file.

Ah yes, agreed that for the updateManualBackport function, it was testing the implementation details of tagBackportReviewers more. Made a new test file with similar changes + a test checking that users is added to reviewers correctly

[dsanders11]

Thanks @alicelovescake!