Fixing inconsistency in applicability for non-uefi systems

[Arden97]

Description:

• This PR includes a minor improvement to the non-UEFI applicability check, changing the Ansible conditional from a mount-based check to a directory existence check, aligning it with the Bash equivalent.

Rationale:

• checking for /boot/efi/ mount point is not enough to find out a system's boot mode

• Fixes file_permissions_grub2_cfg Ansible remediation conditions don't match Testing Farm systems #14113

Review Hints:

• use atex to reserve testing farm and autocontest to run tests, that are mentioned in the issue

[github-actions]

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