chore: aselo-webchat-react-app - add CI job for [CHI-3613]

[gpaoloni]

Description

This PR introduces CI action for aselo-webchat-react-app to, "on push"

• Run lint.
• Run tests.
• Build and upload artifact to the assets buckets.

NOTE: CI is failing cause tests are broken. That's fixed in #3829.

Checklist

• Corresponding issue has been opened
• New tests added
• Feature flags added
• Strings are localized
• Tested for chat contacts
• Tested for call contacts

Verification steps

• Check CI including new jobs.
• Check the artifact is uploaded to the bucket.

AFTER YOU MERGE

1. Cut a release tag using the Github workflow. Wait for it to complete and notify in the #aselo-deploys Slack channel.
2. Comment on the ticket with the release tag version AND any additional instructions required to configure an environment to test the changes.
3. Only then move the ticket into the QA column in JIRA

You are responsible for ensuring the above steps are completed. If you move a ticket into QA without advising what version to test, the QA team will assume the latest tag has the changes. If it does not, the following confusion is on you! :-P

[stephenhand]

LGTM! Maybe comment out the unit test runner while they are failing? Don't like merging failing PRs, though I guess it's ok if you merge the follow up right after