Fix: incorrect string length when emitting descriptors with non-ASCII characters

[Belchy06]

Relevant components:

• Signalling server
• Common library
• Frontend library
• Frontend UI library
• Matchmaker
• Platform scripts
• SFU

Problem statement:

As mentioned in #754, when emitting a UI interaction with non-ascii characters, the calculated byteLength is incorrect.

Solution

Remove the unnecessary usage of textEncoder and use the direct string length.

Test Plan and Compatibility

Tested with UE 5.7 (PixelStreaming2)

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Latest commit: 95d054d

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[github-actions]

💚 All backports created successfully

Status	Branch	Result
✅	UE5.5
✅	UE5.6
✅	UE5.7

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