Allow configure.py to care less about being run on a streamer or not

[rtertiaer]

This PR allows configure.py to care less about it being run on a streamer. This permits us to generate one system image that can run on both types of appliances. The changes aren't hefty:

• deploy all test shortcuts on all appliance types, regardless of their relevance for that particular type. This does not affect end users, but internally we'll need to communicate with manufacturing (@mrahman313 👀 )
• deploy the audiodetector service on everything, even boxes without RCA in - but gatekeep the service launch with a conditional.

I've tested this on both regular and streamer appliances. The test shortcuts get deployed everywhere. The audiodetector service correctly does not launch on streamers, wie so:

pi@amplipi:~ $ systemctl --user status amplipi-audiodetector.service 
● amplipi-audiodetector.service - Amplipi RCA Input Audio Detector
   Loaded: loaded (/home/pi/.config/systemd/user/amplipi-audiodetector.service; enabled; vendor preset: ena[...]
   Active: inactive (dead)
Condition: start condition failed at Tue 2023-12-19 18:33:30 EST; 1min 17s ago
           └─ ConditionPathExists=!/home/pi/.config/amplipi/is_streamer was not met

Dec 19 18:33:30 amplipi systemd[583]: Condition check resulted in Amplipi RCA Input Audio Detector being sk[...]

This PR fixes #573 , which came up during image creation, #542.

[rtertiaer]

Documentation here.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6f5d89a) 51.60% compared to head (7815b41) 51.60%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #575   +/-   ##
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  Coverage   51.60%   51.60%           
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  Files          24       24           
  Lines        5676     5676           
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  Hits         2929     2929           
  Misses       2747     2747           

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unittests	51.60% <ø> (ø)

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[linknum23]

LGTM. The easiest way to validate this works is to upgrade a streamer and then yank that CM3+ and put it in a main unit. Please try something like that before merging this.

[rtertiaer]

spoke IRL; since I've already tested on existing appliances and we'll be doing further testing during the pressing of 0.3.1, we can ship this right now.