refactor: remove mtree as the default output #1548

Job	Run time
matrix-prep-bazelversion	3s
matrix-prep-os	1s
test (ubuntu-latest, 7.1.1, ., true)	2m 26s
test (ubuntu-latest, 7.1.1, ., false)	5m 22s
test (ubuntu-latest, 7.1.1, e2e/wasm, false)	4m 11s
test (ubuntu-latest, 7.1.1, e2e/smoke, true)	16s
test (ubuntu-latest, 7.1.1, e2e/smoke, false)	2m 27s
test (ubuntu-latest, 7.1.1, e2e/assertion, true)	4m 50s
test (ubuntu-latest, 6.4.0, ., true)	2m 57s
test (ubuntu-latest, 6.4.0, ., false)	5m 58s
test (ubuntu-latest, 6.4.0, e2e/wasm, false)	2m 49s
test (ubuntu-latest, 6.4.0, e2e/smoke, true)	14s
test (ubuntu-latest, 6.4.0, e2e/smoke, false)	2m 27s
test (ubuntu-latest, 6.4.0, e2e/assertion, true)	4m 53s
test (macos-13, 7.1.1, ., true)	4m 51s
test (macos-13, 7.1.1, ., false)	5m 8s
test (macos-13, 7.1.1, e2e/smoke, true)	43s
test (macos-13, 7.1.1, e2e/smoke, false)	2m 54s
	52m 30s

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