AI Assistant: Remove slash highlights on Breve

[dhasilva]

Fixes #38699

Proposed changes:

• Removes slashes from the complex words dictionary
• Adds forward slashes to the regex escaping function

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

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

Testing instructions:

• Go to the block editor with Breve enabled
• Add a link with slashes
• Check that the slashes are not highlighted

Before	After

[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 WordPress.com Simple 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, and enable the fix/jetpack-ai-breve-complex-word-slash branch.

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  bin/jetpack-downloader test jetpack fix/jetpack-ai-breve-complex-word-slash
  

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[github-actions]

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[CGastrell]

Worked fine on my tests