chore(storage-browser): Drop self-removal from tasks. Tasks are now r…

[cshfang]

…emoved via state updates

Description of changes

This PR drops the remove function from tasks. A task should be able to cancel its own processing state, but removal of a task should be done to its containing "list". When a location or file item is removed from state, the useProcessTasks hook will now synchronize its internal task ref to reflect the removal as well.

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• [x] Have read the Pull Request Guidelines
• [x] PR description included
• [x] yarn test passes and tests are updated/added
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• [ ] If this change should result in a version bump, changeset added (This can be done after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

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Latest commit: f18c585a71d139fb0fe8a66e5333830968c26c89

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