fix: mutation of decorator's argument values

[ershov-konst]

Decorator arguments are not mutated during mutation. Since arguments may contain references to mutated entities in their structure, this leads to errors like this one.

This PR adds mutation of types contained in decorator arguments.

Fixes: #8769

[timotheeguerin]

Thanks for the investigation and fix!

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commit: 8fd29c8

[github-actions]

All changed packages have been documented.

• ✅ @typespec/compiler

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@typespec/compiler - fix ✏️

Fixed mutation of decorator's argument values