feat: allow configuration of postfix for received screenshots filename

Description

Currently received screenshots are stored with the filename snapshotID + -received + .png. This PR makes the -received part of this configurable.

Motivation and Context

I want to set it to "" (no prefix) to more easily update the baseline images in CI: by outputting the received images to another directory using the options storeReceivedOnFailure: true, updatePassedSnapshot: true, customReceivedDir: …, it is possible to later update the baseline images without running jest again with the -u flag (which takes a very long time and just repeats work already done).

How Has This Been Tested?

In my project and a unit test

Types of Changes

[ ] Bug fix (non-breaking change which fixes an issue)
[x] New feature (non-breaking change which adds functionality)
[ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
[ ] Documentation (adding or updating documentation)
[ ] Dependency update

Checklist:

[x] My change requires a change to the documentation and I have updated the documentation accordingly.
[x] My changes are in sync with the code style of this project.
[x] There aren't any other open Pull Requests for the same issue/update.
[ ] These changes should be applied to a maintenance branch.
[ ] I have added the Apache 2.0 license header to any new files created.

americanexpress / jest-image-snapshot