[wasm] WBT: Use project ids that are safe for use as identifiers #89945
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For every test project, a random id is used which is
Path.GetRandomFileName(). In some cases thisidgets used in agenerated C/C# source file, and that can cause failures.
For example the following fails with:
because the id,
blz_checkfingerprinting_Release_zqkzgkui.ref, was usedas a namespace (line 3).
Fix up the generated random ids to make them safer. The code is taken
from
WasmAppBuilder/ManagedToNativeGenerator.cs.Fixes #86533 .