EventGrid doesn't seem to support blob names with emojis in them

[pantze]

Please provide us with the following information:

This issue is for a: (mark with an x)

- [X] bug report -> please search issues before submitting
- [ ] feature request
- [ ] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)

Minimal steps to reproduce

1. Setup the Azure Event Grid Viewer
2. Create a blob containing an emoji in the filename, for example: "tasklog_14💎.log"
3. The subject string then contains: "tasklog_14��.log"

Any log messages given by the failure

Nope, just that all emojis are replaced with "�"

Expected/desired behavior

That the correct filename is there, with the emoji

OS and Version?

Azure?

Versions

Mention any other details that might be useful

We first noticed this in the messages posted using the storage queue endpoint of the eventgrid subscription.
Then I tested the event-grid-viewer and noticed it had the same problem.
Seems like that event-grid is not encoding the blob files correctly in the events.

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