test: add fixtures for exported classes with decorators

[bradzacher]

PR Checklist

• Addresses an existing open issue: fixes #000
• That issue was marked as accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Just adding these ahead of #5551 so that it's easy to verify that we aren't introducing a regression with the parser upgrade

[typescript-eslint]

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[codecov]

Codecov Report

Merging #5558 (0da3e5d) into main (39829c0) will increase coverage by 0.17%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #5558      +/-   ##
==========================================
+ Coverage   91.57%   91.74%   +0.17%     
==========================================
  Files         132      364     +232     
  Lines        1496    12373   +10877     
  Branches      226     3611    +3385     
==========================================
+ Hits         1370    11352    +9982     
- Misses         62      669     +607     
- Partials       64      352     +288     

Flag	Coverage Δ
unittest	91.74% <ø> (+0.17%)	⬆️

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

Impacted Files	Coverage Δ
...ackages/eslint-plugin/src/rules/no-for-in-array.ts	100.00% <0.00%> (ø)
...plugin/src/rules/no-unnecessary-type-constraint.ts	88.00% <0.00%> (ø)
packages/typescript-estree/src/convert-comments.ts	100.00% <0.00%> (ø)
packages/eslint-plugin/src/rules/no-shadow.ts	75.84% <0.00%> (ø)
...es/eslint-plugin/src/rules/no-unsafe-assignment.ts	94.21% <0.00%> (ø)
...int-plugin/src/rules/require-array-sort-compare.ts	88.23% <0.00%> (ø)
...es/eslint-plugin/src/util/isUndefinedIdentifier.ts	100.00% <0.00%> (ø)
packages/eslint-plugin/src/rules/no-misused-new.ts	100.00% <0.00%> (ø)
packages/utils/src/eslint-utils/index.ts	12.50% <0.00%> (ø)
...ackages/eslint-plugin/src/rules/no-implied-eval.ts	97.05% <0.00%> (ø)
... and 222 more