codesniffer: Add Jetpack.Functions.EscJs sniff

[anomiex]

Closes MONOREP-285

Proposed changes:

WordPress's esc_js() function is a legacy of pre-PHP-5.2 days which does some odd things to the input. In modern code, it will be better to use esc_attr() and/or wp_json_encode().

Now that most existing uses are cleaned up, add a sniff to discourage future use. A few files with remaining uses are added to tools/phpcs-excludelist.json.

Other information:

• Have you written new tests for your changes, if applicable?
• Have you checked the E2E test CI results, and verified that your changes do not break them?
• Have you tested your changes on WordPress.com, if applicable (if so, you'll see a generated comment below with a script to run)?

Jetpack product discussion

Followup to #46229

Does this pull request change what data or activity we track or use?

No

Testing instructions:

• CI happy?
• Try adding new calls to esc_js(). Are they caught?

[github-actions]

Thank you for your PR!

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[jp-launch-control]

Code Coverage Summary

1 file is newly checked for coverage.

File	Coverage
projects/packages/codesniffer/Jetpack/Sniffs/Functions/EscJsSniff.php	10/10 (100.00%) 💚

Full summary · PHP report · JS report

[github-actions]

Are you an Automattician? Please test your changes on all WordPress.com environments to help mitigate accidental explosions.

• To test on WoA, go to the Plugins menu on a WoA dev site. Click on the "Upload" button and follow the upgrade flow to be able to upload, install, and activate the Jetpack Beta plugin. Once the plugin is active, go to Jetpack > Jetpack Beta, select your plugin (Jetpack), and enable the add/codesniffer-esc_js-sniff branch.
• To test on Simple, run the following command on your sandbox:

bin/jetpack-downloader test jetpack add/codesniffer-esc_js-sniff

Interested in more tips and information?

• In your local development environment, use the jetpack rsync command to sync your changes to a WoA dev blog.
• Read more about our development workflow here: PCYsg-eg0-p2
• Figure out when your changes will be shipped to customers here: PCYsg-eg5-p2