Automattic for Agencies: Add support for the newly added A4A Calypso live link environment

[yashwin]

Background

To test the changes done to the newly added environment for Automattic for Agencies on Calypso live links, we need to update the environments here to support that environment.

Changes

This PR

• Adds a8c-for-agencies to the envs in the src/config.ts file.
• Adds a new case to the switch statement for a8c-for-agencies that returns Env resolving NODE_ENV and CALYPSO_ENV to a8c-for-agencies-horizon.

Testing

• Check out this branch and start dserve (it may take a while to update the wp-calypso repo).
• Go to the URL specified in 33ce4-pb/#plain > It should download the image > Verify that you are redirected to Calypso (Automattic for Agencies). Please ignore the empty page.

[yashwin]

I see the Circle CI build is failing here. Appreciate any help on this. Thanks!

[jsnajdr]

Looks good. It's also the kind of PR that didn't really need review.

[yashwin]

Thanks, @jsnajdr!

[jsnajdr]

The CircleCI check is green now 🙂 It was failing because SSH keys used by CircleCI to checkout code from GitHub were no longer working for some reason. I was able to fix it simply by removing the project from CircleCI and then adding it again.

One other thing I tried is to upgrade the testing CircleCI Docker image from the legacy circleci/node:10 to the recent cimg/node:20.11.0, in #225, but that will require more work. Currently yarn install is failing there, failing to build some packages.