platforms: remove usage of SIGCONT

[julianoes]

I was wondering if this was still required or how this worked but it seems like it still works without.

The reason I looked into SIGCONT was that lldb in vscode does currently
not ignore the signal as it should.

@bkueng @dagar what am I missing?

[bkueng]

From what I know this is required. You need this in your ~/.gdbinit:

handle SIGCONT nostop noprint nopass

[dagar]

We should take a closer look to see what's actually happening with "HRT" in this case.

For the regular work queues (HPWORK and LPWORK ported from NuttX), we're pretty close to being able to delete them entirely. #12068

[julianoes]

@bkueng in theory the SIGCONT signal is ignored in lldb ran by vscode, in practice unfortunately not: https://discuss.px4.io/t/vscode-lldb-debugging-paused-on-exception/13512/11

[julianoes]

@dagar ok cool, let's continue with moving everything over and then getting rid of them.

[julianoes]

@dagar is this gone already?

[julianoes]

Follow up in #12068.