* Playwright: improve failure report when an unexpected shield exists
If we discover an E2E shield when we didn't expect one, let's make the error
message more helpful by checking the tooltip.
* Playwright: fix (hopefully) flaky shields test
Wait for our user to fetch the bot's identity before running the test, to work
around a race in the shield logic.
Hopefully, fixes https://github.com/element-hq/element-web/issues/28061
5547101bcc