fix: scanner and optimizer should skip wasm

[sapphi-red]

Description

#8219 removed wasm from KNOWN_ASSET_TYPES to prevent import wasmUrl from './foo.wasm'.
But that caused scanner/optimizer to include wasm files.
This fixes that.

refs #9256

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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