Rework photometry filters

[dr-rodriguez]

This updates the Photometry and PhotometryFilters table in various ways:

• UCD column moved from Photometry to PhotometryFilters
• instrument and telescope columns removed from PhotometryFilters
• Foreign Key of Photometry reworked to point to Telescopes
• instrument column removed from Photometry (in anticipation of Rework Instruments table #380)

Closes #293

[kelle]

This looks good but I admit to not having my head fully wrapped around it. Should we write some tests to go along with it?

[dr-rodriguez]

We have tests that query Photometry and PhotometryFilters already, I'm not sure what else we would add to them. The database will not build if the foreign keys and similar are not set.

I did notice the tests failing with the Instruments change (#380), but that's a separate PR.

[kelle]

This change will break the ingest_photometry function. The tests still pass because there are currently no tests for that function. I will open an issue to write tests and modify the ingest_photometry function accordingly.