[PERTE-233] Refactor dispatch screen as a single list

[JuanIgAcosta]

Issue: #233

Related issues:

• coopcycle/coopcycle#234
• coopcycle/coopcycle#198

Related PRs:

• [PERTE-233] Added color to TaskList entity coopcycle-web#4965

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Follow the guidelines in the issue description to make the first basic and usable UI version for dispatcher screen.

Consider the task box to be like:

• Clicking anywhere in the white rectangle it will go to the specific/individual task details.
• The big gray ">" goes at each task (no more "grouping") but when clicked goes to the order/delivery details.
• If the task is an standalone one (it's not a part of an order) then do not display the big gray ">".

Tasks:

• Think about design (paddings, components, etc)
  Done by @luanacuello (see figma)
• Create the issue to update needed components for task card with the new layout.
  • Update task card with the new layout and behaviour coopcycle#330
  • Update dispatch screen with new layout and behaviour coopcycle#331
• Check if "sticky header" from SectionList works fine.
• Ensure user can assign unassigned tasks
• Ensure user can unassign assigned tasks
• Add refetch functionallity
• Add loading spinner
• Remove unused components/screens
• Merge changes from PR/branch: [PERTE-313] Use new TaskList update endpoint at /api/task_lists/set_items/{date}/{username} #1983
• Check if everything works fine from courier section!
• Add at least one test.