Playwright: run tests headlessly, take 2. (#56712)

* Export headless env var

* Fix HEADLESS env var.
Re-add xvfb-run.

* Try dropping xvfb-run

* Enable all tests

.teamcity/_self/projects/WebApp.kt

@@ -627,6 +627,7 @@ fun playwrightPrBuildType( targetDevice: String, buildUuid: String ): BuildType
 					export NODE_CONFIG_ENV=test
 					export PLAYWRIGHT_BROWSERS_PATH=0
 					export TEAMCITY_VERSION=2021
+					export HEADLESS=true
 
 					# Decrypt config
 					openssl aes-256-cbc -md sha1 -d -in ./config/encrypted.enc -out ./config/local-test.json -k "%CONFIG_E2E_ENCRYPTION_KEY%"
@@ -637,7 +638,7 @@ fun playwrightPrBuildType( targetDevice: String, buildUuid: String ): BuildType
 					export NODE_CONFIG="{\"calypsoBaseURL\":\"${'$'}{URL%/}\"}"
 					export DEBUG=pw:api
 
-					xvfb-run yarn jest --reporters=jest-teamcity --reporters=default --maxWorkers=%E2E_WORKERS% --group=calypso-pr
+					yarn jest --reporters=jest-teamcity --reporters=default --maxWorkers=%E2E_WORKERS% --group=calypso-pr
 				""".trimIndent()
 				dockerImage = "%docker_image_e2e%"
 			}
@@ -751,11 +752,12 @@ object PreReleaseE2ETests : BuildType({
 				export LOCALE=en
 				export NODE_CONFIG="{\"calypsoBaseURL\":\"${'$'}{URL%/}\"}"
 				export DEBUG=pw:api
+				export HEADLESS=true
 
 				# Decrypt config
 				openssl aes-256-cbc -md sha1 -d -in ./config/encrypted.enc -out ./config/local-test.json -k "%CONFIG_E2E_ENCRYPTION_KEY%"
 
-				xvfb-run yarn jest --reporters=jest-teamcity --reporters=default --maxWorkers=%E2E_WORKERS% --group=calypso-release
+				yarn jest --reporters=jest-teamcity --reporters=default --maxWorkers=%E2E_WORKERS% --group=calypso-release
 			""".trimIndent()
 			dockerImage = "%docker_image_e2e%"
 		}