[web]implement in-house sha1 hash function (#18651)

* implement in-house sha1 hash function

* add comment

* add test description

Co-authored-by: Antoine Clausse <antoine.clausse@overleaf.com>

* add more tests

* dedupe test strings and remove unneeded toString calls

---------

Co-authored-by: Antoine Clausse <antoine.clausse@overleaf.com>
GitOrigin-RevId: aa3f5ab3ff412696c715521381eebf176f503197

services/web/frontend/js/features/ide-react/context/references-context.tsx

@@ -1,5 +1,5 @@
 // @ts-ignore
-import CryptoJSSHA1 from 'crypto-js/sha1'
+import { generateSHA1Hash } from '../../../shared/utils/sha1'
 import {
   createContext,
   useContext,
@@ -94,9 +94,9 @@ export const ReferencesProvider: FC = ({ children }) => {
       const docId = doc.doc_id
       const snapshot = doc._doc.snapshot
       const now = Date.now()
-      const sha1 = CryptoJSSHA1(
+      const sha1 = generateSHA1Hash(
         'blob ' + snapshot.length + '\x00' + snapshot
-      ).toString()
+      )
       const CACHE_LIFETIME = 6 * 3600 * 1000 // allow reindexing every 6 hours
       const cacheEntry = existingIndexHash[docId]
       const isCached =