POLIO-1958: add exclusion list for prep worksheets

[quang-le]

Client adds worksheets to the preparedness google sheet, and it breaks everyting

Related JIRA tickets : POLIO-1958

Self proofreading checklist

• Did I use eslint and ruff formatters?
• Is my code clear enough and well documented?
• Are my typescript files well typed?
• New translations have been added or updated if new strings have been introduced in the frontend
• My migrations file are included
• Are there enough tests?
• Documentation has been included (for new feature)

Doc

Tell us where the doc can be found (docs folder, wiki, in the code...).

Changes

• Hard coded an exclusion on common sheet names
• Added a config for additional exclusions
• Fixed small bug with round number in the preparedness parser

How to test

• Generate a preparedness sheet (needs a round with a scope and a future start date)
• Add empty worksheets to the generated sheets
• rename at least 1.
• Add the custom worksheet name to the preparedness_sheetnames_blacklistconfig (add it if necessary: it just a list of strings). In the new sheet, add (in any cell) the string: "Summary of Regional Level Preparedness"(this will circumvent the exclusion mechanism already in place)
• From the preparedness tab, launch a refresh: the additional sheets should not trigger errors

Note

This should go in the next release one way or another since it would solve refresh problems with an actual upcoming campaign

[tdethier]

It works fine after applying the suggested change 👍