Fix flaky test_numfig_disabled_warn by ensuring fresh build

[kartben]

When shared_result cache is empty but artifacts exist, the build was incorrectly skipped, leaving app.warning empty. Force freshenv=True and disable build skipping in this case to ensure warnings are generated.

Fixes sphinx-doc/sphinx#14104

Purpose

References

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[jayaddison]

The single test failure seems unrelated -- perhaps an overfitted regex number-of-decimal-places expectation (expecting exactly three digits where perhaps shorter values are possible).

Edit: fixup: overfittered is not a word

[AA-Turner]

Is there a more local fix we could find?

A

[jayaddison]

The single test failure seems unrelated -- perhaps an overfitted regex number-of-decimal-places expectation (expecting exactly three digits where perhaps shorter values are possible).

Edit: fixup: overfittered is not a word

This wasn't entirely accurate -- but either way, I've filed that (unrelated) problem as #14109.