tests: Use neutral npm proxy wording

[Paveltarno]

What?

The skipped exec suite now describes the test-environment limitation as an npm proxy TLS incompatibility with Deno. This keeps the reason visible in Vitest without referring to the proxy operator.

Follow-up to #603.

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🔗 Origin task in dev3: open in dev3 · dev3://task/a223448a-f7ee-412b-b926-47ad2f5b6316

[github-actions]

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