[ENH] should CI for a pyproject.toml change turn off incremental testing?

[fkiraly]

Question for CI in the case where we update pyproject.toml, such as this one:
#5538

In such a case, should we not run all the tests while turning off incremental testing?

That is, to ensure that estimators depending on the extra do not break, or detect that they break.

This could be achieved in two locations - GHA, or run_tests_for_class, adding one more conditional so it always defaults to True if the pyproject.toml has changed.

FYI @yarnabrina, @benHeid

[yarnabrina]

Makes sense (and I'll agree if you disable even sub-sampling). But it'll possibly lead to long duration in my opinion unless #5477 is solved.

[fkiraly]

One could argue, the deps are so important so we should test really everything if they change - dep changes are, after all, relatively rare.