feat(PPDSC-2273): add pr and job urls to applitools batch name

[mstuartf]

PPDSC-2273

What

1. Background - applitools issues are hard to debug
2. What did you do

• Use built-in CircleCI env variables to override default Applitools batchname with useful info.
• Make sure the curl request to close Applitools batches is always sent (for docs and components). At the moment the request is not sent if any tests in the suite, so the batch would remain open. Subsequent pipeline runs for the same commit would therefore add more tests to the same batch, rather than creating a new batch. This means that we cannot remove the global 'auto close batches' setting. Currently this is what closes our batches (and is also the reason why our batches are randomly split sometimes).

3. What does the reviewers should expect -

Batch names follow the format BRANCH_NAME:COMMIT_SHA (PR_URL, JOB_URL). E.g.:

The Close the Applitools Batch step for doc site and component visual test jobs should run even if the test step fails.

I have done:

• Written unit tests against changes
• Written functional tests against the component and/or NewsKit site
• Updated relevant documentation

I have tested manually:

• The feature's functionality is working as expected on Chrome, Firefox, Safari and Edge
• The screen reader reads and flows through the elements as expected.
• There are no new errors in the browser console coming from this PR.
• When visual test is not added, it renders correctly on different browsers and mobile viewports (Safari, Firefox, small mobile viewport, tablet)
• The Playground feature is working as expected

Before:

After:

Who should review this PR:

How to test:

[newskit-engineering]

You can preview these changes on:
Documentation Site: http://ncu-newskit-docs.s3-website-eu-west-1.amazonaws.com/ppdsc-2273-applitools-info
Storybook: http://ncu-newskit-docs.s3-website-eu-west-1.amazonaws.com/ppdsc-2273-applitools-info/storybook