CMake: Improve _qmllint target for QML modules

While the new qmllint target mostly works great, there are three remaining issues with our new qmllint target:

• the qmllint target does not depend on the qmltypes getting generated yet. That needs to be fixed especially in CI settings where certain runners might just want to call the qmllint target Done
• the qmllint target calls qmllint on the copied module files instead of the original source location (in combination with the generated .qrc as a --resource option so it can find all of its sibling files) Done

The following has now been split out to its own separate task in QTBUG-95157 due to a lower priority:

• I think there still isn't a variable to invoke qmllint with --json? It'd be a great to make that possible with either a target property or an additional qmllint_json target