test_dict and test_abstract of test_capi unconditionally import _testcapi module

[sobolevn]

Bug report

All other tests guard this import with import_helper.import_module('_testcapi') (or something else). Example:

cpython/Lib/test/test_capi/test_watchers.py

Lines 4 to 8 in 7e30821

	from test.support import catch_unraisable_exception, import_helper
	# Skip this test if the _testcapi module isn't available.
	_testcapi = import_helper.import_module('_testcapi')

Because some other Python implementations might not have this module.

I think that we should always check that _testcapi might be missing.
I have a PR ready.

Linked PRs

• gh-110529: Guard _testcapi imports in tests #110530