mark fastboot-test-scenarios as private #771

Job	Run time
Test Packages (16.x, ubuntu-latest)	41s
Test Packages (16.x, windows-latest)	25s
lint-all-packages	30s
discover_matrix	25s
Test Packages (14.x, ubuntu-latest)	41s
Ember Tests (16.x, ubuntu-latest)	39s
Test Packages (14.x, windows-latest)	27s
Legacy Mocha Tests - 16.x	21s
Ember Tests (16.x, windows-latest)	25s
ember-try for ember-cli-fastboot: ember-lts-3.16	26s
Ember Tests (14.x, ubuntu-latest)	35s
Legacy Mocha Tests - 14.x	24s
ember-try for ember-cli-fastboot: ember-lts-3.20	40s
Ember Tests (14.x, windows-latest)	25s
ember-try for ember-cli-fastboot: ember-lts-3.24	40s
ember-try for ember-cli-fastboot: ember-lts-3.28	41s
ember-try for ember-cli-fastboot: ember-lts-4.4	39s
ember-try for ember-cli-fastboot: ember-lts-4.8	1s
ember-try for ember-cli-fastboot: ember-lts-4.12	38s
ember-try for ember-cli-fastboot: ember-lts-5.4	1s
ember-try for ember-cli-fastboot: ember-release	1s
ember-try for ember-cli-fastboot: ember-beta	40s
ember-try for ember-cli-fastboot: ember-canary	38s
ember-try for ember-cli-fastboot: embroider-safe	1s
ember-try for ember-cli-fastboot: embroider-optimized	1s
ember-try for ember-cli-fastboot: no-deprecations	1s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	1s
${{ matrix.name }}	1s
	11m 8s

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