Block Library: Don't use methods with the 'gutenberg_' prefix

[Mamaduka]

What

PR replaces the gutenberg_ prefix in block PHP files.

Why?

These files are bundled with the package and should use methods also available in WP Core.

How?

• Updates the styles engine function to use core alternatives.
• Renamed filter callbacks to match the general naming convention.

Testing Instructions

CI tests should be green.

The navigation inspector animation testing instructions - #46342

[github-actions]

Flaky tests detected in df09832.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/4065094619
📝 Reported issues:

• [Flaky Test] should always expand single line selection #39787 in specs/editor/various/multi-block-selection.test.js
• [Flaky Test] shouldn't conflict with server-side autosave #35176 in specs/editor/various/autosave.test.js

[ntsekouras]

We can do this quick fix for now(renaming), but we need to see what we're going to do with __experimentalBlockInspectorAnimation introduced here.

This setting is part of the auditing of experimental API for 6.2. @artemiomorales is this something that we want to stabilize or exclude from 6.2?

If the plan is to remain experimental, among the changes that will be needed, these functions(for the two other blocks) would need to be moved in different files and not remain here.

[ntsekouras]

Thank you George!