shared-typing: Silence str-enum member shadowing in the generated code

datamodel-codegen renders schema enums as str-based enum classes, so a
member named after a str method (the aggregation function "count")
shadows that method and trips mypy's assignment check. The postprocess
step now appends "# type: ignore[assignment]" to such members, replacing
the blanket disable of the assignment check for the generated
cmk.shared_typing.vue_formspec_components module.

Change-Id: Id6a34e3d87d28eaa3b1f47a679bb60d072f4e4d9