Keep track of manual provider_location overrides

[Mr0grog]

We have some situations where the database has manually entered data for provider locations, and we have to be very careful not to accidentally overwrite it. Instead, we should be tracking a list of manually overridden

One example of this is that NJVSS has some bad 4-digit zip codes, and they are manually fixed in our database. The NJVSS loader has to be very careful to check for bad zip codes so as not to overwrite what’s in that field in the DB: https://github.com/usdigitalresponse/appointment-availability-infra/blob/ce4c936107d2a449d530d41e7d24b5e32f68dffe/loader/src/sources/njvss/index.js#L402-L407

We could track manual overrides in a new DB table as part of #202, but it might be better (especially in the short term) to simply keep them in a file in our source code. Storing them in a source code file means they are easy to see, review, and update (and we multiple eyes on them via PRs). We don’t have any GUI that gives us a similarly clear window into overrides we might store in the database. (Props to @janovergoor for pointing this out.)

[Mr0grog]

Zip codes that were overridden for NJVSS (we should start by having these in the overrides file):

Bad Zip	Good Zip	IIS ID	Name
7505	07505	13354:CITYRX_PHARMACY	"CityRX Pharmacy, 7 W Broadway, Paterson, NJ"
0703	07030	13289:HOBOKEN_FAMILY_PHARMACY	"Hoboken Family Pharmacy, 307 1st Street, Hoboken, NJ"
8817	08817	10872:WALMART_5201	"Walmart 5201"
8087	08087	11280:WALMART_3830	"Walmart 3830"
7095	07095	10873:WALMART_5281	"Walmart 5281"
7836	07836	10904:WALMART_3291	"Walmart 3291"
7032	07032	10866:WALMART_5447	"Walmart 5447"
7852	07852	13184:WALMART_3912	"Walmart 3912"
7866	07866	10899:WALMART_5178	"Walmart 5178"
8096	08096	10924:WALMART_3422	"Walmart 3422"
7036	07036	10901:WALMART_3469	"Walmart 3469"
8857	08857	10862:WALMART_4153	"Walmart 4153"
8094	08094	10928:WALMART_3774	"Walmart 3774"
7083	07083	10903:WALMART_3292	"Walmart 3292"
8734	08734	10871:WALMART_5414	"Walmart 5414"
8096	08096	10930:WALMART/SAMS_6670	"Walmart/Sams 6670"
8094	08094	10929:WALMART/SAMS_4722	"Walmart/Sams 4722"
8232	08232	10931:WALMART/SAMS_8144	"Walmart/Sams 8144"
8817	08817	10868:WALMART/SAMS_6369	"Walmart/Sams 6369"
8077	08077	10932:WALMART/SAMS_8145	"Walmart/Sams 8145"
7728	07728	10870:WALMART/SAMS_6671	"Walmart/Sams 6671"
7094	07974	10896:WALMART/SAMS_4774	"Walmart/Sams 4774"
8863	08863	13341:AR-EX_PHARMACY	"AR-EX PHARMACY"
7047	07047	752:NORTH_BERGEN_HEALTH_DEPARTMENT	"NORTH BERGEN HEALTH DEPARTMENT"