Remove blockType

[huyenltnguyen]

Description

We renamed blockType to blockLabel in the main repo but applied a patch to v1 and v2 scripts for backward compatibility: freeCodeCamp/freeCodeCamp@7b606a7.

Mobile has also been updated to handle both blockType and blockLabel:

mobile/mobile-app/lib/models/learn/curriculum_model.dart

Lines 236 to 239 in 1a5b519

	// Support both blockLabel and blockType for backward compatibility
	label: (data['blockLabel'] ?? data['blockType']) != null
	? blockLabelFromString(data['blockLabel'] ?? data['blockType'])
	: BlockLabel.legacy,

The next steps are:

• Update v2 script to return blockLabel
• Once that change is live, remove blockLabel from the curriculum_model's parsing logic

[huyenltnguyen]

The blockType property has been renamed to blockLabel. We can work on this once the change is deployed to production.