Allow `type: 'unknown'` in our Configuration schema #3532

Job	Run time
build / build	1m 35s
lint / lint	1m 17s
home-view-unit-tests / lint	11s
agent / native (macos-latest)	38s
agent / native (windows-latest)	1m 17s
vscode / native (macos-latest)	1m 4s
agent / native (ubuntu-latest)	33s
vscode / native (windows-latest)	4m 35s
vscode / native (ubuntu-latest)	1m 11s
bats / native (ubuntu-latest)	4m 48s
package / vscode	4m 9s
archive / archive	33s
vscode-ui / ui-tests (ubuntu-latest)	6m 23s
upload / upload	51s
	29m 5s

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