Staying in active mode through end of commissioning fails if commissioning window closes before commissioning ends

[bzbarsky-apple]

Even after #23936 we can end up going back to sleep in the middle of commissioning as follows:

1. A commissioning window is opened for 5 mins
2. We enter active mode.
3. Foud (4) minutes later a PASE session is established and commissioning starts.
4. One (1) minute after that the commissioning window timer fires and we close the commissioning window, which takes us out of active mode, even though commissioning may not be done.

What we should probably do is that if the commissioning window is closed while we have a live PASE session we stay in active mode until the PASE session is closed.

[bzbarsky-apple]

@jepenven-silabs @jtung-apple

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[bzbarsky-apple]

The spec has now been clarified to say that we stay in active mode as long as either a commissioning window is open or a fail-safe is armed.

We currently implement the former, but we should implement the latter.