refactor(robot-server): add time link to /health, refactor system/time links #6517
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Overview
PR #6501 uses the time endpoints to check & update robot's system time. In the absence of a time endpoint, which is true for all versions < 3.21, the app would get a 404 for this endpoint. This PR adds a time link to the health endpoint so that the app can check for the presence of time endpoints and only then attempt to use them.
Changelog
Risk assessment
Low. Doesn't touch any critical components