fix: manually update apollo cache on activity completion

[mohsinht]

• Sometimes the cache is not properly updated in case of form submission or checklist submission. The same completed activity is shown to the user again. We've been observing this in DataDog tests and Checkly. To solve this issue, I've added a hook that forces the Apollo Cache to update the session activities manually. (see loom)
  • Please note that the cache was previously updated by the subscriptions only. With this change in the PR, we now update the cache when a form/checklist is submitted + when an activity is updated from subscription.
• We also had a tech debt that we are using indices to navigate through the activities instead of their IDs. This PR also includes a small refactor that addresses this change.

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[rahulkeerthi]

I see that you've updated the hooks associated with mutations for messages, forms and checklists. Does the cache update hook need to be used for other user activity types/hooks? e.g. cal.com booking activity?

[mohsinht]

Does the cache update hook need to be used for other user activity types/hooks? e.g. cal.com booking activity?

Yes, I was adding cache update function where we call handleNavigateToNextActivity(). It was indeed missing in the extension activities. Thanks for pointing that out