test: clear the frameloop before each test

Before this commit, we cleared the frameloop after each test, but that led to issues where RenderResult objects were unmounted *after* the frameloop was cleared, which can start the frameloop up again before the next test.

Author: aleclarson

packages/core/test/setup.ts

@@ -17,6 +17,7 @@ let frameCache: WeakMap<any, any[]>
 beforeEach(() => {
   isRunning = true
   frameCache = new WeakMap()
+  frameLoop.clear()
 
   global.mockRaf = createMockRaf()
   Globals.assign({
@@ -31,7 +32,6 @@ beforeEach(() => {
 
 afterEach(() => {
   isRunning = false
-  frameLoop.clear()
 })
 
 // This observes every SpringValue animation when "advanceUntil" is used.