Fix build

[krwq]

Fix build:

• Run:

build -pack /p:ApiCompatGenerateSuppressionFile=true

• change pipelines configuration (some settings prevented helix from running)
• attempt to fix PWM tests

Microsoft Reviewers: Open in CodeFlow

[Ellerbach]

We should be able to change programmatically the pin behavior:

iot/src/devices/Board/RaspberryPiBoard.cs

Line 449 in 82a5abd

protected override void ActivatePinMode(int pinNumber, PinUsage usage)

So something like:

RaspberryPiBoard board = new();
board.ActivatePinMode(12, PinUsage.Pwm);

should set the PWM mode