Fix disabled Jest tests and make them run in CI

Created by: limitedmage

The following tests are failing locally and are not being run in CI. They have been disabled as part of #31956 and should be either fixed, added to CI, and re-enabled; or deleted if no longer needed.

client/common/src/util/hashCode.test.ts
 ● hashCode › UUIDs
 ● hashCode › is deterministic

client/codeintellify/src/hoverifier.test.ts
 ● Hoverifier › debounces mousemove events before showing overlay
 ● Hoverifier › keeps the overlay open when the mouse briefly moves over another token on the way to the overlay
 ● Hoverifier › dedupes mouseover and mousemove event on same token```