tests: use stable MAS integration in Synapse (#30473)

* tests: use stable MAS integration in Synapse

* Automatically follow MAS main branch

* Update the pinned Synapse container image to latest develop

* Update element-web-playwright-common to 1.4.5

* Fix the typing of the MAS config

* Update playwright-common to 1.4.6

* Use the modern MAS -> Synapse API

* Relax MAS rate limiting

* Revert using the modern API explicitly, it is now the default

* Better adjust the MAS rate limits

package.json

@@ -187,7 +187,7 @@
         "@babel/runtime": "^7.12.5",
         "@casualbot/jest-sonar-reporter": "2.2.7",
         "@element-hq/element-call-embedded": "0.14.1",
-        "@element-hq/element-web-playwright-common": "^1.4.4",
+        "@element-hq/element-web-playwright-common": "^1.4.6",
         "@peculiar/webcrypto": "^1.4.3",
         "@playwright/test": "^1.50.1",
         "@principalstudio/html-webpack-inject-preload": "^1.2.7",