remove unnecessary files #320

Job	Run time
check_code_format	51s
check_licenses_net472 (App)	3m 33s
check_licenses (net6.0, App)	33s
check_version_command (net6.0)	37s
check_licenses_net472 (Tests)	1m 41s
check_licenses (net6.0, Tests)	2m 22s
check_version_command (net7.0)	45s
check_version_command_net472	4m 7s
check_licenses_net472 (ProjectWithReferenceContainingLicenseExpression)	3m 29s
check_licenses (net6.0, ProjectWithReferenceContainingLicenseExpression)	35s
check_version_command (net8.0)	35s
check_licenses (net7.0, App)	40s
test_windows (net6.0)	7m 36s
check_licenses (net7.0, Tests)	48s
test (ubuntu-latest, net6.0)	1m 43s
test_windows (net7.0)	6m 56s
check_licenses (net7.0, ProjectWithReferenceContainingLicenseExpression)	36s
test (ubuntu-latest, net7.0)	1m 32s
test_windows (net8.0)	5m 40s
check_licenses (net8.0, App)	44s
test (ubuntu-latest, net8.0)	1m 32s
test_windows (net472)	9m 25s
check_licenses (net8.0, Tests)	35s
test (macos-latest, net6.0)	2m 43s
check_licenses (net8.0, ProjectWithReferenceContainingLicenseExpression)	33s
test (macos-latest, net7.0)	2m 34s
test (macos-latest, net8.0)	1m 51s
	1h 4m 36s

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