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[INTERNAL] Azure: Disable AVA worker threads

This is to workaround for the
"FATAL ERROR: v8::FromJust Maybe value is Nothing." errors we see for
our Windows and macOS test executions on Azure.

The error is sporadic, but most consistently appears on Windows 2022
(Azure image '20230630.1.0' and Node v18.16.1.

https://github.com/avajs/ava/issues/2947 seems to suggest this is a
Node.js issue as reported at https://github.com/nodejs/node/issues/43304

Disabling the use of our own worker threads in minifier.js resolve the
issue. Disabling worker threads in AVA resolves it too.

Since we want to test our worker threads, we opted for the latter by
setting the AVA option '--no-worker-threads' for all scripts executed in
Azure.

All this indicates an issue with using worker threads (or the workerpool
package) from within workers.

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