Superfluous comment when verifySubmitterjob fails

[nvdaes]

Summary

The createManualApproval job is triggered when verifySubmitter job fails, and this maybe hard to avoid.
This is harmless and doesn'thave negative effects, since the pull request to approve add-ons won't be created, because the reviewedAddons.json file is not modified by previous jobs. However, the superfluous comment may be confusing.
See

#3086, specifically:

#3806 (comment)

Proposal

Create a PR in nvaccess/addon-datastore-staging, trying to post the comment just if the cpr step has a number corresponding to a created pull request.