[devtools] Fix `dbgconf` handling when not present in PDSC #290

Job	Run time
setup / config	3s
coverage	2m 43s
matrix_prep / matrix_prep	13s
build (macos-14, darwin, arm64, publicRepo, packchk)	1m 46s
test (windows-2019, windows, arm64, always, packchk.exe)	3m 23s
build (ubuntu-22.04, linux, arm64, always, packchk)	2m 35s
build (ubuntu-22.04, linux, amd64, always, packchk)	1m 54s
test (ubuntu-22.04, linux, arm64, always, packchk)	2m 36s
test (windows-2019, windows, amd64, always, packchk.exe)	3m 31s
build (windows-2019, windows, arm64, always, packchk.exe)	4m 39s
test (macos-14, darwin, arm64, publicRepo, packchk)	1m 46s
build (macos-13, darwin, amd64, publicRepo, packchk)	2m 55s
test (ubuntu-22.04, linux, amd64, always, packchk)	2m 13s
build (windows-2019, windows, amd64, always, packchk.exe)	3m 43s
test (macos-13, darwin, amd64, publicRepo, packchk)	3m 45s
Publish Tests Results	10s
release	0s
	37m 55s

Provide feedback