Zcu: rename `skip_analysis_errors` to `skip_analysis_this_update` and respect it
On updates with failed files, we should refrain from doing any semantic
analysis, or even touching codegen/link. That way, incremental
compilation state is untouched for when the user fixes the AstGen
errors.
Resolves: #23205
a0401cf3e4mlugg committed on 3/11/2025, 11:38:32 PMparent24db007