tests

Client: Use addNewExtension() #1743

Job	Run time
xmllint	20s
test (ubuntu-latest, minimal, 5.15.*)	5m 31s
test (ubuntu-latest, full, 5.15.*)	52s
cpp-linter	1m 35s
test (ubuntu-latest, full-debug, 5.15.*)	1m 34s
reuse	16s
test (macos-latest, minimal, 5.15.*)	8m 18s
windows	8m 43s
test (macos-latest, full, 5.15.*)	7m 15s
test (macos-latest, full-debug, 5.15.*)	6m 7s
test (ubuntu-latest, full, 5.9.*)	41s
test (ubuntu-latest, minimal, 6.0.*)	2m 22s
test (ubuntu-latest, minimal, 6..)	7m 58s
test (macos-latest, minimal, 6..)	10m 38s
	1h 2m 10s

Provide feedback