Add string to int cleaning for USAFacts

[chinandrew]

Description

Add a cleaning step to usafacts to prevent against the bug that happened last week where one of the count values was "1,020" instead of 1020.

Changelog

• Add a line that looks at any str's that were parsed, removes commas, and casts them to ints.
• Update test to check this behavior and also add a few more cases/values of interest (e.g. cruise ship fips). Previously, the test only checked that the column headers were correct. To write this new test, I ran the test with the new data on main and saved the output, and then used that output as the test case when I introduced this new change

Fixes

• Fixes Make CSV processing more robust for USAFacts (or more generally?) #461

[chinandrew]

ok seems like i broke some other tests, will fix (EDIT: fixed)

[krivard]

lgtm

(also <3 these checks, nice work)