UI update headless chrome flags to fix 'yarn run test:oss' (#8035)

* UI update headless chrome flags to fix ember/chrome crash in test

* UI update references from test-oss to test:oss

* UI removed disable-gpu flag from headless Chrome

* UI and also remove the comment

Makefile

@@ -150,7 +150,7 @@ test-ember:
 	@echo "--> Installing JavaScript assets"
 	@cd ui && yarn --ignore-optional
 	@echo "--> Running ember tests"
-	@cd ui && yarn run test-oss
+	@cd ui && yarn run test:oss
 
 ember-ci-test: # Deprecated, to be removed soon.
 	@echo "ember-ci-test is deprecated in favour of test-ui-browserstack"

ui/README.md

@@ -72,8 +72,8 @@ Running tests will spin up a Vault dev server on port 9200 via a
 pretest script that testem (the test runner) executes. All of the
 acceptance tests then run, proxing requests back to that server.
 
-- `yarn run test-oss`
-- `yarn run test-oss -s` to keep the test server running after the initial run.
+- `yarn run test:oss`
+- `yarn run test:oss -s` to keep the test server running after the initial run.
 - `yarn run test -f="policies"` to filter the tests that are run. `-f` gets passed into
   [QUnit's `filter` config](https://api.qunitjs.com/config/QUnit.config#qunitconfigfilter-string--default-undefined)
 - `yarn run test:browserstack` to run the kv acceptance tests in Browserstack

ui/testem.js

@@ -10,7 +10,6 @@ const config = {
         // --no-sandbox is needed when running Chrome inside a container
         process.env.CI ? '--no-sandbox' : null,
         '--headless',
-        '--disable-gpu',
         '--disable-software-rasterizer',
         '--mute-audio',
         '--remote-debugging-port=0',