Pull request #1983: PIPE-3258: fix reference antenna fallback and caltable cleanup in `hifv_semiFinalBPdcals`
Merge in PIPE/pipeline from PIPE-3258-antenna-fully-flagged-during-bandpass-scan-still-used-as-refant to main
* commit '8dabe1b5b997da832ea10696bb0a42d11d6c2337': PIPE-3258: preserve list type in refant fallback and align testBPdcals PIPE-3258: fix reference antenna fallback and caltable cleanup in `hifv_semiFinalBPdcals`
PIPE-3258: preserve list type in refant fallback and align testBPdcals
Use list slicing instead of `np.delete` for refant fallback, clean up delay caltables on retry in testBPdcals, and streamline docstrings.
PIPE-3258: fix reference antenna fallback and caltable cleanup in `hifv_semiFinalBPdcals`
Propagate the updated reference antenna list in the delaycal retry loop, clean up preexisting delay caltables, and guard against empty antenna lists.
