feat!: Mark all Error enums as non_exhaustive

[aborgna-q]

#2027 ended up being breaking due to adding a new variant to an error enum missing the non_exhaustive marker.

This (breaking) PR makes sure all error enums have the flag.

BREAKING CHANGE: Marked all Error enums as non_exhaustive

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.14%. Comparing base (09de9e3) to head (134b4f4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2056      +/-   ##
==========================================
- Coverage   83.14%   83.14%   -0.01%     
==========================================
  Files         217      217              
  Lines       42130    42130              
  Branches    38308    38308              
==========================================
- Hits        35028    35027       -1     
- Misses       5134     5135       +1     
  Partials     1968     1968              

Flag	Coverage Δ
python	85.40% <ø> (ø)
rust	82.91% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[hugrbot]

This PR contains breaking changes to the public Rust API.

cargo-semver-checks summary

--- failure enum_marked_non_exhaustive: enum marked #[non_exhaustive] ---

Description:
A public enum has been marked #[non_exhaustive]. Pattern-matching on it outside of its crate must now include a wildcard pattern like `_`, or it will fail to compile.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#attr-adding-non-exhaustive
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.40.0/src/lints/enum_marked_non_exhaustive.ron

Failed in:
enum SignatureError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-core/src/extension.rs:382
enum ImportError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-core/src/import.rs:39
enum OrderHintError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-core/src/import.rs:80

--- failure enum_marked_non_exhaustive: enum marked #[non_exhaustive] ---

Description:
A public enum has been marked #[non_exhaustive]. Pattern-matching on it outside of its crate must now include a wildcard pattern like `_`, or it will fail to compile.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#attr-adding-non-exhaustive
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.40.0/src/lints/enum_marked_non_exhaustive.ron

Failed in:
enum ResolveError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-model/src/v0/ast/resolve.rs:366
enum ModelError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-model/src/v0/table/mod.rs:460

--- failure enum_marked_non_exhaustive: enum marked #[non_exhaustive] ---

Description:
A public enum has been marked #[non_exhaustive]. Pattern-matching on it outside of its crate must now include a wildcard pattern like `_`, or it will fail to compile.
      ref: https://doc.rust-lang.org/cargo/reference/semver.html#attr-adding-non-exhaustive
     impl: https://github.com/obi1kenobi/cargo-semver-checks/tree/v0.40.0/src/lints/enum_marked_non_exhaustive.ron

Failed in:
enum NonLocalEdgesError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-passes/src/non_local.rs:27
enum LinearizeError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-passes/src/replace_types/linearize.rs:131
enum ValidatePassError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-passes/src/validation.rs:29
enum LowerError in /home/runner/work/hugr/hugr/PR_BRANCH/hugr-passes/src/lower.rs:39