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 ✅

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Additional details and impacted files

@@                  Coverage Diff                  @@
##             release-rs-v0.16.0    #2056   +/-   ##
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  Hits                          ?    34435           
  Misses                        ?     5295           
  Partials                      ?     1804           

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python	85.40% <ø> (?)
rust	82.65% <ø> (?)

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

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