Update "Use task handles" instance attribute label

[BigRoy]

Changelog Description

Update instance attribute label "Use Asset Handles" to "Use Task Handles"

Additional info

This makes it match in wording with the validation itself AND the repair action's label that reads "Disable use Task Handles"

It's basically cosmetics.

Testing notes:

1. Publish an instance
2. Toggle on the instance should make sense.

[MustafaJafar]

I wonder if should we refactor the plugin name. and fix it in settings too.

Will that be compatible with existent instances ?
Edit: surprisingly, yes as it won't affect any current instances because we use use_handles publish attribute.
publish attributes:

    "CollectAssetHandles": {
        "use_handles": true
    },

---

I've refactored names from asset to task completely.
find it in this branch enhancement/collect_task_handles_label_refactor_further_more
feel free to fetch and merge it if you find it useful.

Also, I tested changes in my branch it seems to work as usual.

[MustafaJafar]

This PR works fine since we don't refactor the plugin class name therefore the settings works as usual.

But, if you would like to test my suggested changes, please find it in my previous comment.
which also was tested and works fine on my side. so feel free to merge the PR at its current state or after merging my suggestions.

[BigRoy]

Edit: surprisingly, yes as it won't affect any current instances because we use use_handles publish attribute.
publish attributes:

Actually - that branch shouldn't be backwards compatible since it's stored in publish_attributes["CollectAssetHandles"] before but publish_attributes["CollectTaskHandles"] after. I feel like it's not worth it to lose backwards compatibility over. I'll merge this PR since yours continues on it anyway and we can debate more if we want to break that backwards compatibility for the small cleanup on the class name and the settings name.