Fix a race in CHIPDeviceController while shutting down

[sagar-apple]

Problem

The CHIPDeviceController can accept new jobs on its workqueue even though a "shutdown" is queued up. Because of this each Job has to make sure it checks the isRunning state of the controller before performing any tasks.

This is an unfortunate side-effect of not knowing whether or not a Shutdown has occurred since the current Job was queued up.

Change overview

Make sure to check isRunning while calling getConnectedDevice

Testing

How was this tested? (at least one bullet point required)
Since this was a race it is not straightforward to write a deterministic test.

• If manually tested, what platforms controller and device platforms were manually tested, and how?
  Ran the Controller lifecycle tests a few 100x. It doesn't flake anymore.

[github-actions]

Size increase report for "esp32-example-build" from 017daa6

File	Section	File	VM
chip-shell.elf	.flash.text	20	20
chip-temperature-measurement-app.elf	.flash.text	-60	-60
chip-lock-app.elf	.flash.text	64	64

Full report output

BLOAT REPORT

Files found only in the build output:
    report.csv

Comparing ./master_artifact/chip-shell.elf and ./pull_artifact/chip-shell.elf:

sections,vmsize,filesize
.flash.text,20,20
[Unmapped],0,-20

Comparing ./master_artifact/chip-temperature-measurement-app.elf and ./pull_artifact/chip-temperature-measurement-app.elf:

sections,vmsize,filesize
[Unmapped],0,60
.flash.text,-60,-60

Comparing ./master_artifact/chip-bridge-app.elf and ./pull_artifact/chip-bridge-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-lock-app.elf and ./pull_artifact/chip-lock-app.elf:

sections,vmsize,filesize
.flash.text,64,64
[Unmapped],0,-64

Comparing ./master_artifact/chip-pigweed-app.elf and ./pull_artifact/chip-pigweed-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-ipv6only-app.elf and ./pull_artifact/chip-ipv6only-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-all-clusters-app.elf and ./pull_artifact/chip-all-clusters-app.elf:

sections,vmsize,filesize

Comparing ./master_artifact/chip-persistent-storage.elf and ./pull_artifact/chip-persistent-storage.elf:

sections,vmsize,filesize