discovery+autopilot: revert passing contexts to Start methods

[ellemouton]

Our pattern of having Start/Stop for each subsystem very much depends on Stop being responsible for proper clean-up of the subsystem - if we pass in a parent context to Start and it gets cancelled - Stop might not get to properly clean itself up.

ctx threading is about making synchronous calls "stoppable". So it should only be passed to a Start method if Start itself is making synchronous calls before returning. If Start spins off asynchronous goroutines, those should be separate from the context & Stop should be responsible for cleaning those up.

So im reverting two small changes from previous PR here. Luckily, if we follow the above approach, the scope for the remainder of the "context" thread PRs gets reduced significantly .

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[yyforyongyu]

I think we wanna rely on the cancel/done signal from the ctx but not quit?

The purpose of adding the ctx to some of the public methods is to allow the caller to abort the call. Currently, each call only listens to the quit signal to abort, and we now add a ctx, it can either be canceled externally or internally. And when it's internal, it's functioning the same as calling close(quit), which makes the quit channel redundant.

Also asked gemini and it's interesting that it suggests us to make this usage an exception - that we should put the ctx on the struct albeit it being anti-pattern.

[bhandras]

LGTM! ✅