[test optimization] Align RUM flush wait to 500ms (#7625)

Author: juan-fernandez

packages/datadog-instrumentations/src/playwright.js

@@ -41,7 +41,7 @@ const testSuiteToTestStatuses = new Map()
 const testSuiteToErrors = new Map()
 const testsToTestStatuses = new Map()
 
-const RUM_FLUSH_WAIT_TIME = Number(getValueFromEnvSources('DD_CIVISIBILITY_RUM_FLUSH_WAIT_MILLIS')) || 1000
+const RUM_FLUSH_WAIT_TIME = Number(getValueFromEnvSources('DD_CIVISIBILITY_RUM_FLUSH_WAIT_MILLIS')) || 500
 
 let applyRepeatEachIndex = null