[web] use a global shared mock for the metrics module (#32799)

GitOrigin-RevId: 72874ba6c06c2a602b01cc029bc9c71ce3ce8892

services/web/test/unit/src/BetaProgram/BetaProgramHandler.test.mjs

@@ -22,12 +22,6 @@ describe('BetaProgramHandler', function () {
       save: sinon.stub().callsArgWith(0, null),
     }
 
-    vi.doMock('@overleaf/metrics', () => ({
-      default: {
-        inc: sinon.stub(),
-      },
-    }))
-
     vi.doMock('../../../../app/src/Features/User/UserUpdater', () => ({
       default: (ctx.UserUpdater = {
         promises: {