Remove final instance of BashOperator from tests

[kiersten-stokes]

Fixes failing test on main.

What changes were proposed in this pull request?

Removes the final instance of AIRFLOW_COMPONENT_CACHE_INSTANCE in favor of the new AIRFLOW_TEST_OPERATOR_CATALOG instance created in #2815

How was this pull request tested?

Tests are passing locally

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[ptitzler]

LGTM!