test: always keep trace viewer and remove DEBUG_MODE env variable

bigbluebutton-tests/playwright/.env.template

@@ -2,5 +2,4 @@
 BBB_URL=""                        # https://DOMAIN_NAME/bigbluebutton/api
 BBB_SECRET=""
 
-DEBUG_MODE=""                     # (true / false|empty) Enable or disable debug features
 TIMEOUT_MULTIPLIER=1              # (number / empty) Apply a multiplier on default timeouts - depending the server strength (not recommended to use greater values than 3)

bigbluebutton-tests/playwright/playwright.config.js

@@ -3,7 +3,6 @@ const { chromiumConfig, firefoxConfig, webkitConfig } = require('./core/browsers
 const { ELEMENT_WAIT_TIME } = require('./core/constants');
 
 const CI = process.env.CI === 'true';
-const DEBUG_MODE = process.env.DEBUG_MODE === 'true';
 
 const config = {
   workers: CI ? 1 : 2,
@@ -16,9 +15,7 @@ const config = {
   fullyParallel: CI,
   use: {
     headless: true,
-    trace: DEBUG_MODE ? 'on'
-      : CI ? 'retain-on-failure'
-        : 'off',
+    trace: 'on',
     screenshot: 'on',
     video: 'on',
   },