fixes to get auto_selfcal to run cleanly with allow_cocal=True

[jjtobin]

With various changes introduced recently, co-cal, the application of solutions from successfully self-calibrated targets to non-self-calibrated targets was non-functional. The purpose of this PR is to fix the co-cal code.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 76.68539% with 83 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
auto_selfcal/mosaic_helpers.py	47.82%	48 Missing ⚠️
auto_selfcal/run_selfcal.py	61.36%	17 Missing ⚠️
auto_selfcal/prepare_cocal.py	91.01%	8 Missing ⚠️
auto_selfcal/gaincal_wrapper.py	92.04%	7 Missing ⚠️
auto_selfcal/selfcal_helpers.py	83.33%	3 Missing ⚠️
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Files with missing lines	Coverage Δ
auto_selfcal/auto_selfcal.py	72.18% <100.00%> (+13.52%)	⬆️
auto_selfcal/prepare_selfcal.py	91.06% <100.00%> (+0.29%)	⬆️
auto_selfcal/tests/test_auto_selfcal.py	64.34% <100.00%> (ø)
auto_selfcal/selfcal_helpers.py	70.83% <83.33%> (+2.40%)	⬆️
auto_selfcal/gaincal_wrapper.py	88.03% <92.04%> (+15.13%)	⬆️
auto_selfcal/prepare_cocal.py	91.01% <91.01%> (ø)
auto_selfcal/run_selfcal.py	74.69% <61.36%> (+4.52%)	⬆️
auto_selfcal/mosaic_helpers.py	62.08% <47.82%> (-14.58%)	⬇️

... and 1 file with indirect coverage changes

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