feat(app): Add GET /deck_configuration notification support

[mjhuff]

Closes EXEC-263

Overview

This is the FE equivalent of #14986. Refactors GET /deck_configuration to use notifications.

Test Plan

• First, push feat(robot-server): add deck_configuration notification publisher #14986 to a robot. You may verify notifications for deck config are emitted by following the test plan in that PR.
• Open the network tab and go to some page/modal with deck config. Verify there is no polling.
• Alter the deck config. Depending on which deck config you're using, the exact manner in which the data is sent to the server varies, but you should at some point see generally 1-2 network requests to deck_configuration.

Changelog

• Add desktop app & ODD MQTT support to GET /deck_configuration.

Risk assessment

low - this is probably the most straightforward of all routes.

[TamarZanzouri]

LGTM!

[koji]

tested with a Flex and this branch worked as expected.
the changes look good to me.

I just left 2 comments, but they are just coding style.