Fix workspace protocol to use caret to avoid unnecessary duplication #789

Job	Run time
Test Packages (16.x, ubuntu-latest)	1m 11s
Test Packages (16.x, windows-latest)	3m 26s
lint-all-packages	35s
Test Packages (14.x, ubuntu-latest)	1m 17s
Ember Tests (16.x, ubuntu-latest)	54s
Test Packages (14.x, windows-latest)	4m 8s
Legacy Mocha Tests - 16.x	24s
Ember Tests (16.x, windows-latest)	3m 13s
Ember Tests (14.x, ubuntu-latest)	1m 1s
ember-try for ember-cli-fastboot: ember-lts-3.16	42s
Legacy Mocha Tests - 14.x	28s
ember-try for ember-cli-fastboot: ember-lts-3.20	55s
Ember Tests (14.x, windows-latest)	3m 22s
discover_matrix	19s
ember-try for ember-cli-fastboot: ember-lts-3.24	50s
ember-try for ember-cli-fastboot: ember-lts-3.28	44s
ember-try for ember-cli-fastboot: ember-lts-4.4	50s
ember-try for ember-cli-fastboot: ember-lts-4.8	52s
ember-try for ember-cli-fastboot: ember-lts-4.12	56s
ember-try for ember-cli-fastboot: ember-lts-5.4	1m 0s
ember-try for ember-cli-fastboot: ember-release	47s
ember-try for ember-cli-fastboot: ember-beta	44s
ember-try for ember-cli-fastboot: ember-canary	55s
ember-try for ember-cli-fastboot: embroider-safe	58s
ember-try for ember-cli-fastboot: embroider-optimized	58s
ember-try for ember-cli-fastboot: no-deprecations	50s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	45s
custom-output-paths	40s
ember-cli-fastboot	41s
fastboot-config-location	30s
fastboot-express-middleware	34s
fastboot-location	44s
fastboot-shoebox-test	33s
integration-tests	1m 26s
oneerror-per-visit	1m 1s
request-details	36s
root-url	30s
	40m 19s

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