remove /dev/shm partition definitions from kickstarts

[vojtapolasek]

Port of #11534 into master branch.

[github-actions]

Start a new ephemeral environment with changes proposed in this pull request:

Fedora Environment

Oracle Linux 8 Environment

[codeclimate]

Code Climate has analyzed commit 0fead28 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 58.3% (0.0% change).

View more on Code Climate.

[jan-cerny]

/packit retest-failed

[jan-cerny]

Thanks for your removal We have had a similar issue with a /dev/shm recently. We have discovered that if /dev/shm is created by a kickstart then it works in a unattended installation but it breaks GUI installation. The reason was that the fstype tmpfs isn't supported by Anaconda so the GUI checks for it and doesn't have an option for it, but the cmdline most likely lacks this safeguard checks and creates a partition anyway. So I agree with removing these /dev/shms from kickstarts, because they rely on an unsupported feature and undefined behavior.