Tighten up eslint rule to catch unused const {_} = useLingui() (#9122)

* tighten eslint config to catch unused `useLingui`s

* fix now-invalid uses of _

* remove unused function that produces a ton of eslint warnings

* upgrade react compiler plugin

src/lib/strings/helpers.ts

@@ -62,23 +62,6 @@ export function useWarnMaxGraphemeCount({
   }, [splitter, maxCount, text])
 }
 
-// https://stackoverflow.com/a/52171480
-export function toHashCode(str: string, seed = 0): number {
-  let h1 = 0xdeadbeef ^ seed,
-    h2 = 0x41c6ce57 ^ seed
-  for (let i = 0, ch; i < str.length; i++) {
-    ch = str.charCodeAt(i)
-    h1 = Math.imul(h1 ^ ch, 2654435761)
-    h2 = Math.imul(h2 ^ ch, 1597334677)
-  }
-  h1 = Math.imul(h1 ^ (h1 >>> 16), 2246822507)
-  h1 ^= Math.imul(h2 ^ (h2 >>> 13), 3266489909)
-  h2 = Math.imul(h2 ^ (h2 >>> 16), 2246822507)
-  h2 ^= Math.imul(h1 ^ (h1 >>> 13), 3266489909)
-
-  return 4294967296 * (2097151 & h2) + (h1 >>> 0)
-}
-
 export function countLines(str: string | undefined): number {
   if (!str) return 0
   return str.match(/\n/g)?.length ?? 0