Compiler cleanups

[mppf]

This PR takes the following cleanup steps:

• moves frontend/lib/framework/(parser-error-classes-list.cpp,resolution-error-classes-list.cpp} to the frontend/lib/parsing and frontend/lib/resolution directories, and similarly moves the headers
• moves UnsupportedAsIdent to parser errors list since it is emitted by post-parse-checks
• fix extra space in some error messages and avoids an unhelpful "In module" output for one error message (follow-up to PR improve dyno scope resolve errors with lookup tracing #21637)
• updates a number of loops like for (auto elt : something()) to use for (const auto& elt : something()) in cases where the element type is bigger than a pointer. The version without the & will cause a copy of the element on each iteration.

Reviewed by @DanilaFe - thanks!

• full local testing
• no new --dyno failures