some tests with approved stubs have the wrong error

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for example, the testLimitLegacyStubErrorVolume test:

mypy/test-data/unit/check-modules.test

Lines 3015 to 3018 in bd53039

	[case testLimitLegacyStubErrorVolume]
	# flags: --disallow-any-expr --soft-error-limit=5
	import certifi # E: Cannot find implementation or library stub for module named "certifi" \
	# N: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports

since certifi is an approved stub, it should instead suggest installing them, like it does here:

>mypy -c "import certifi"
<string>:1: error: Library stubs not installed for "certifi" (or incompatible with Python 3.10)  [import]
<string>:1: note: Hint: "python3 -m pip install types-certifi"
<string>:1: note: (or run "mypy --install-types" to install all missing stub packages)
<string>:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
Found 1 error in 1 file (checked 1 source file)

but for some reason, these tests (and also the playground) don't do that