chore(mads/hds): remove custom cache implementation

[lahabana]

In mads and hds we were using a custom implementation of a cache. This was unfortunate as go-control-plane has a perfectly working one.

The only feature on this cache was the ability to long poll. This was only required in mads and we've changed the handler of mads to make this handling outside of the cache.

This is more complete fix to problems like: #11578 as there is now only one reconciling loop.

Checklist prior to review

• Link to relevant issue as well as docs and UI issues --
• This will not break child repos: it doesn't hardcode values (.e.g "kumahq" as a image registry) and it will work on Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Tests (Unit test, E2E tests, manual test on universal and k8s) --
  • Don't forget ci/ labels to run additional/fewer tests
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? (this GH action will add "backport" label based on these file globs, if you want to prevent it from adding the "backport" label use no-backport-autolabel label) --