Add replay E2E test

[mydea]

We want to add at least one E2E test for capturing replays.

Things to test:

• Event payloads are sent correctly when compressed
• Event payloads are sent correctly when uncompressed
• Payloads handle Unicode characters (e.g. Emojis)
• PII stripped works as expected (??)

[github-actions]

This issue has gone three weeks without activity. In another week, I will close it.

But! If you comment or otherwise update it, I will reset the clock, and if you label it Status: Backlog or Status: In Progress, I will leave it alone ... forever!

---

"A weed is but an unloved flower." ― Ella Wheeler Wilcox 🥀