Support optional python and r section attributes #3780

Job	Run time
home-view-unit-tests / lint	18s
build / build	1m 48s
lint / lint	1m 28s
agent / native (macos-latest)	42s
agent / native (windows-latest)	1m 21s
vscode / native (macos-latest)	57s
agent / native (ubuntu-latest)	35s
vscode / native (windows-latest)	3m 58s
vscode / native (ubuntu-latest)	1m 22s
package / vscode	4m 9s
archive / archive	35s
upload / upload	46s
vscode-ui / ui-tests (ubuntu-latest)	5m 23s
	23m 22s

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