Fix workspace protocol to use caret to avoid unnecessary duplication #811

Job	Run time
Test Packages (16.x, ubuntu-latest)	1m 46s
Test Packages (16.x, windows-latest)	3m 56s
lint-all-packages	43s
Test Packages (14.x, ubuntu-latest)	1m 37s
discover_matrix	34s
Ember Tests (16.x, ubuntu-latest)	1m 15s
Test Packages (14.x, windows-latest)	3m 27s
Ember Tests (16.x, windows-latest)	2m 50s
Legacy Mocha Tests - 16.x	38s
Ember Tests (14.x, ubuntu-latest)	1m 1s
Legacy Mocha Tests - 14.x	33s
Ember Tests (14.x, windows-latest)	2m 28s
ember-try for ember-cli-fastboot: ember-lts-3.16	58s
ember-try for ember-cli-fastboot: ember-lts-3.20	56s
ember-try for ember-cli-fastboot: ember-lts-3.24	1m 11s
ember-try for ember-cli-fastboot: ember-lts-3.28	1m 1s
ember-try for ember-cli-fastboot: ember-lts-4.4	50s
ember-try for ember-cli-fastboot: ember-lts-4.8	55s
ember-try for ember-cli-fastboot: ember-lts-4.12	2m 5s
ember-try for ember-cli-fastboot: ember-lts-5.4	40s
ember-try for ember-cli-fastboot: ember-release	48s
ember-try for ember-cli-fastboot: ember-beta	1m 12s
ember-try for ember-cli-fastboot: ember-canary	1m 12s
ember-try for ember-cli-fastboot: embroider-safe	41s
ember-try for ember-cli-fastboot: embroider-optimized	36s
ember-try for ember-cli-fastboot: no-deprecations	50s
ember-try for ember-cli-fastboot: ember-release-no-deprecations	54s
custom-output-paths	31s
ember-cli-fastboot	32s
fastboot-config-location	40s
fastboot-express-middleware	31s
fastboot-location	40s
fastboot-shoebox-test	39s
integration-tests	1m 24s
oneerror-per-visit	1m 2s
request-details	41s
root-url	39s
	42m 56s

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