refactor(app): consolidate robot restart state, add restarting spinner

[mcous]

overview

Precursor to an upcoming PR for #4267

This PR consolidates state about whether a restart request has been issued for a given robot from the http-api-client (very old janky HTTP API state) and discovery (good, but with restart status jammed in) state trees. It moves server restart to its own tree at robotAdmin.

It also ditches the old (shoehorned in) restarting banner in-favor of a more buildroot-style full screen spinner, re-using the same spinner as robot homing.

changelog

• refactor(app): consolidate robot restart state, add restarting spinner

review requests

Please test the user flows that this affects:

• Restart button in robot page
• Factory reset wizard
• Deck calibration wizard
• Buildroot update wizard (should be completely unaffected)

[codecov]

Codecov Report

Merging #4283 into edge will increase coverage by 0.06%.
The diff coverage is 76.71%.

@@            Coverage Diff             @@
##             edge    #4283      +/-   ##
==========================================
+ Coverage   56.45%   56.51%   +0.06%     
==========================================
  Files         876      880       +4     
  Lines       24867    24860       -7     
==========================================
+ Hits        14038    14050      +12     
+ Misses      10829    10810      -19

Impacted Files	Coverage Δ
app/src/http-api-client/index.js	100% <ø> (ø)	⬆️
app/src/reducer.js	0% <ø> (ø)	⬆️
.../src/components/CalibrateDeck/InstructionsModal.js	0% <ø> (ø)	⬆️
app/src/http-api-client/reducer.js	100% <ø> (ø)	⬆️
app/src/pages/Robots/RobotSettings.js	0% <0%> (ø)	⬆️
...pp/src/components/RobotSettings/ResetRobotModal.js	0% <0%> (ø)	⬆️
app/src/components/RobotSettings/ControlsCard.js	0% <0%> (ø)	⬆️
...c/components/RobotSettings/ReachableRobotBanner.js	0% <0%> (ø)	⬆️
app/src/robot/api-client/client.js	85.16% <0%> (ø)	⬆️
app/src/robot-admin/epic.js	100% <100%> (ø)
... and 13 more

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[Kadee80]

• Restart button in robot page
• Factory reset wizard
• Deck calibration wizard
• Buildroot update wizard unaffected
• [ ]