Do not remove sh from path in the new CMake helper

[danimtb]

Changelog: Feature: Do not remove sh from the path in the new CMake helper.
Docs: conan-io/docs#2055

#TAGS: slow

• Refer to the issue that supports this Pull Request: closes Remove removal of "sh" from path for MinGW in CMake #8597
• If the issue has missing info, explain the purpose/use case/pain/need that covers this Pull Request.
• I've read the Contributing guide.
• I've followed the PEP8 style guides for Python code.
• I've opened another PR in the Conan docs repo to the develop branch, documenting this one.

^{Note: By default this PR will skip the slower tests and will use a limited set of python versions. Check here how to increase the testing level by writing some tags in the current PR body text.}

[memsharded]

This goes to develop2 branch! Update: My bad, it is good in develop, it only affects new CMake tools

It will need the CMAKE-SH_NOTFOUND, maybe this is not sufficiently covered by tests, I would expect something to fail. Maybe it is a "slow" test?

[danimtb]

I was expecting the test added here or other ones using mingw to fail with this PR but it is not happening. The Ci is using CMake 3.17.3 (https://ci.conan.io/blue/organizations/jenkins/ConanTestSuite/detail/PR-8625/4/pipeline/307/#step-355-log-1441) that do not raise error if ssh is in the path (it was fixed in CMake 3.17.0 https://gitlab.kitware.com/cmake/cmake/-/merge_requests/3978).

We need to run a lower version in the CI in order to test this properly.