Fix notifications ICSHWI-8815

This is a merge request to fix the infinite loop described in ICSHWI-8815. Please see discussion in that issue.

Currently this merge request can't be fully tested/work for commands due to the problems described in ICSHWI-9003 about our broken webhook.

Here's what the merge request does:

• Adds AWX job polling to notifications as a temporary workaround for the original bug described in ICSHWI-8815
• Remove loops/queries/polling for deployments, commands and jobs from NotificationsProvider and perform them in dedicated child components DeploymentWatcher, CommandWatcher, and AWXJobWatcher which watch a single id at a time.
• Introduced useSafePolling hook so the watchers do not issue a new query before the previous query has returned.
• Fix the context value for NotificationsProvider to provide the notifications as state
• Memoize context value to not rerender the consumers every time the NotificationProvider renders
• Updates consumers of NotificationProvider to use notifications state instead of accessing local storage.
• Refactors code for notifications into Notifications.js for the context, Storage.js for local storage operations, and Watchers.js for components responsible for polling