Removes ignored errors from staticClassAccess.privateMethod.neon baseline file

[dpanta94]

Removes in total 20 errors.

Removes errors from the below phpstan baselines and fixes the issues that they were covering:

• staticClassAccess.privateMethod.neon

How ?

Replaces usage of static:: with self:: in classes which were using self while trying to access API meant to be private.

This is safe to merge. Even if the static usage was aimed to be used for overwrite via inheritance, if a Child class would try to overwrite the private static methods a fatal error would be thrown.

Trac ticket: https://core.trac.wordpress.org/ticket/65817

Use of AI Tools

AI assistance: Yes
Tool(s): Claude Code
Model(s): Opus 5
Used for: Help with suggesting how to fix the phpstan output for the specific errors we are removing the baselines for. The actual result has been reviewed and are owned by me.

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