Run downstream tests (unit & acceptance) if test fixtures are modified

[melinath]

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Details

GoogleCloudPlatform/magic-modules#10469 had to be reverted due to failures that were not caught because no go files were modified. test-fixtures is a fairly common pattern for storing non-go files used in tests - we should detect changes to those files when deciding whether to run tests on a PR.

References

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[github-actions]

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