qunitjs / eslint-plugin-qunit / 21776093265

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test: test under ESLint v10 (#663)

Fixes https://github.com/qunitjs/eslint-plugin-qunit/issues/655.

**Title:** chore: add ESLint 10 CI testing and remove deprecated `type`
from test errors

## Summary

- Removed the `type` property from RuleTester error objects across 21
test files (168 instances). ESLint 10 throws if `type` is present in
invalid test case errors. This is backward-compatible with ESLint 8/9
since `type` was always optional.
- Added a CI step to run unit tests against ESLint 10 on Node 20.x,
following the same pattern used historically when adding ESLint 8
support.
- Bumped `@typescript-eslint/parser` to 8.54.0 for ESLint 10
compatibility (`ScopeManager#addGlobals`).

## Test plan

- All 1353 tests pass on both ESLint 9 and ESLint 10.

837 of 922 branches covered (90.78%)

Branch coverage included in aggregate %.

5 of 5 new or added lines in 5 files covered. (100.0%)

998 of 1072 relevant lines covered (93.1%)

303.63 hits per line