If -Dtests=false, but -Dhse-python:tests=true, the test runner is not getting picked up

[tristan957]

Description

Test runner is not getting picked up correctly.

Steps to reproduce

No response

Linux Distribution

Any

File System

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Other System details

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[tristan957]

Not really sure how solveable this is. hse-python doesn't add the test setup as the default because it is a subproject so that it doesn't interfere with the hse default test setup. Meson provides no API to ask if a default test setup currently exists.