feat(search): make other searches diacritic insensitive with the unaccent extension

[kfc35]

Fixes opencollective/opencollective#8582

• Adds the unaccent extension in the postgres db, which includes a function that can remove diacritics from strings.
• Uses the new unaccent function on db fields when they are being filtered with an ILIKE, and prepare search terms with removeDiacritics accordingly
  • In sql-search.ts, buildSearchConditions and buildKyselySearchConditions uses unaccent and removeDiacritics for searching on text fields.
  • As a consequence of this change, for sequelize-based queries built on buildSearchConditions, sequelize.col complains if the column name could be ambiguous. So, I went through all the usages of buildSearchConditions and specified the tables for textFields where necessary (just whenever there was an include clause aka an associated table / join. I figured usages that did not have an include would not have this problem.)
  • There were a one-off query using sequelize and a couple of one-off queries using Kysely that used an ILIKE that I had to manually convert to use unaccent. The fact that these aren’t centralized feels a little off to me personally.

For reviewing, sql-search.ts has the main logic change. CommunityQuery.ts, OrdersCollectionQuery.ts and Host.ts also has new usages of unaccent since they are one-offs. The other changes are due to sequelize.col needing more specific column references.

I think I got all the relevant places where there is search, but given my unfamiliarity with the whole codebase, I wouldn’t be surprised if I missed some. As a caveat, I also haven’t thought about performance at all while implementing this.

Screenshots of various pages with diacritic insensitive search