WP 7.0: Remove dependencies and rely on what's in core

[dkotter]

Note

This is the first PR in a set of three. #272 and #275 will come next once this is merged

What?

Partially closes #244

Instead of including a number of dependencies, use what is in WordPress 7.0

Why?

This is the first PR on the path of adding full support for WordPress 7.0 and the new AI Client that is included there. WP 7.0 will include the AI Client and so we no longer need to bundle that.

How?

• Removes the now unused automattic/jetpack-autoloader, wordpress/mcp-adapter and wordpress/wp-ai-client dependencies
• Updates other dependencies to their latest
• Remove the initialization of the AI Client
• Switch back to using the standard composer autoloader
• Temporarily ignore PHPStan errors around the AI Client

Use of AI Tools

None

Testing Instructions

This is the first PR in a series that will bring full support to WP 7.0. As such, things aren't in a fully usable state yet. If you test this PR, you should be able to install/activate the plugin on both WP 6.9 and WP 7.0 (no fatals in either) but the plugin won't fully work in either yet

Note

Unit and E2E tests are failing. Those will be fixed up once full 7.0 support is in place.

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Co-authored-by: dkotter <dkotter@git.wordpress.org>
Co-authored-by: jeffpaul <jeffpaul@git.wordpress.org>
Co-authored-by: felixarntz <flixos90@git.wordpress.org>
Co-authored-by: Jameswlepage <isotropic@git.wordpress.org>

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[felixarntz]

@dkotter Mostly looks good! A few comments.

[felixarntz]

Thanks @dkotter!