[HigherOrderOps] Saner error message (#107459)
Sometimes the Unsupported error messages can be pretty opaque (see
https://github.com/pytorch/pytorch/issues/106390 for an example). This
PR ensures the error message says something sane by raising a new
Unsupported exception (that includes the older one in the stack trace)
with a description of what's going on.
Test Plan:
- new test utility to check that a dictionary matches a regex so we
don't need to write out this super long error message every time.
- new tests
Pull Request resolved: https://github.com/pytorch/pytorch/pull/107459
Approved by: https://github.com/ydwu4, https://github.com/kshitij12345
