Platforms `uefi` and `non-uefi` have duplicate code, that could be refactored with the help of platform expressions

#### Description of problem:

The `non-uefi` platform is redundant. The `uefi` platform condition can be inverted in the platform expression: `not uefi`.

#### Proposed change:

Remove `non-uefi` platform and replace all occurrences with `not uefi`.

#### References:

1. https://github.com/ComplianceAsCode/content/blob/master/shared/applicability/non-uefi.yml
2. https://github.com/ComplianceAsCode/content/blob/master/shared/applicability/uefi.yml
3. #10500