refactor: remove mtree as the default output #1549

Job	Run time
matrix-prep-os	1s
matrix-prep-bazelversion	4s
test (ubuntu-latest, 7.1.1, ., true)	5m 57s
test (ubuntu-latest, 7.1.1, ., false)	41s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 13s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	28s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 28s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	4m 28s
test (ubuntu-latest, 6.4.0, ., true)	6m 15s
test (ubuntu-latest, 6.4.0, ., false)	3m 13s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	2m 50s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	2m 28s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	16s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	5m 26s
test (macos-13, 7.1.1, ., true)	3m 41s
test (macos-13, 7.1.1, ., false)	3m 45s
test (macos-13, 7.1.1, e2e/smoke, true)	36s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 51s
	49m 41s

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