Update dependency NUnit to v4 #1148

Job	Run time
TypeScript lint checks	2m 28s
Python Code Format and Validation	27s
Kubernetes integration tests	11m 49s
DigitalOceanCs integration tests	12m 27s
DigitalOceanJs integration tests	3m 14s
Go unit tests	3m 12s
Python unit tests	3m 45s
DigitalOceanTs integration tests	12m 43s
.NET unit tests (testing-unit-cs)	2m 40s
DigitalOceanPy integration tests	13m 30s
.NET unit tests (testing-unit-cs-mocks)	2m 43s
DigitalOceanFs integration tests	3m 3s
TypeScript unit tests	2m 37s
.NET unit tests (testing-unit-fs-mocks)	2m 54s
AwsCs integration tests	5m 59s
AwsJs integration tests	19m 37s
AwsTs integration tests	42m 30s
AwsPy integration tests	9m 2s
AwsFs integration tests	5m 5s
AzureCs integration tests	12m 2s
AzureJs integration tests	3m 11s
AzureTs integration tests	14m 55s
AzurePy integration tests	13m 18s
AzureFs integration tests	12m 41s
GcpCs integration tests	3m 9s
GcpJs integration tests	12m 38s
GcpTs integration tests	6m 2s
GcpPy integration tests	7m 49s
GcpFs integration tests	3m 15s
PacketCs integration tests	3m 3s
PacketJs integration tests	2m 57s
PacketTs integration tests	2m 33s
PacketPy integration tests	3m 7s
PacketFs integration tests	2m 14s
EquinixMetalCs integration tests	2m 52s
EquinixMetalJs integration tests	2m 49s
EquinixMetalTs integration tests	2m 57s
EquinixMetalPy integration tests	2m 29s
EquinixMetalFs integration tests	3m 1s
	4h 36m 47s

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