[CI] Add separate pipeline option for enabling dCache regression tests
Description
This MR makes the dCache regression tests run when DCACHE_REGRESSION_TESTS is set to TRUE. This allows us to better control when this test runs.
Checklist
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Documentation reflects the changes made. -
Merge Request title is clear, concise, and suitable as a changelog entry. See our contributing docs
References
Closes #1318 (closed)