Create expanding `TreeSection` #2354

Job	Run time
build / build	2m 35s
agent / native (macos-latest)	47s
vscode / native (macos-latest)	1m 13s
lint / lint	54s
agent / native (windows-latest)	3m 30s
vscode / native (windows-latest)	1m 47s
agent / native (ubuntu-latest)	41s
vscode / native (ubuntu-latest)	53s
web / web	27s
cypress / native (macos-latest)	1m 49s
archive / archive	20s
package / vscode	2m 47s
bats / native (ubuntu-latest)	3m 7s
cypress / native (windows-latest)	3m 14s
cypress / native (ubuntu-latest)	46s
upload / upload	48s
	25m 38s

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