Removes fetchExtensionCompatibility in UpdateController class

[laoneo]

User description

joomla/joomla-cms#45436

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PR Type

documentation

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Description

• Added documentation for removal of fetchExtensionCompatibility method.

• Provided migration guidance to use batchextensioncompatibility instead.

• Updated backward incompatibility notes for UpdateController changes.

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Changes walkthrough 📝

	Relevant files
Documentation	removed-backward-incompatibility.md Add migration note for UpdateController method removal      migrations/54-60/removed-backward-incompatibility.md Added section documenting removal of fetchExtensionCompatibility in UpdateController. Provided code example for migration to batchextensioncompatibility. Linked related PR and described the rationale for the change. +14/-0

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