bug/RHEL identity update for 8

[justin-octo]

RHEL 8 removed the word "Server" from the PRETTY NAME. This caused RHEL 8 servers to not be able to identify

I probably need to re-submit this with a proper Branch name. And maybe submit an issue...

Description

Added the ability of the os_is_redhat function to properly detect RHEL 8.

TODOs

Please ensure all of these TODOs are completed before asking for a review.

• Ensure the branch is named correctly with the issue number. e.g: feature/new-vpc-endpoints-955 or bug/missing-count-param-434.
• Update the docs.
• Keep the changes backward compatible where possible.
• Run the pre-commit checks successfully.
• Run the relevant tests successfully.
• Ensure any 3rd party code adheres with our license policy or delete this line if its not applicable.

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