Fix faasd CE install script for RHEL-based systems

[welteki]

Description

Fixes for install.sh:

• Removes the check-update command. This comand is not required and caused the script to exit early if packages are not up to date.
• DNF is now used to install packages. DNF is the successor of YUM on the latest RHEL-based systems.

Improvements for install-edge.sh:

• Don't install weak dependencies.

Motivation and Context

• I have raised an issue to propose this change this is required

Fix install.sh script for RHEL-based systems.

How Has This Been Tested?

Both install.sh and install-edge.sh have been tested on Rocky Linux 9.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

Commits:

• I've read the CONTRIBUTION guide
• My commit message has a body and describe how this was tested and why it is required.
• I have signed-off my commits with git commit -s for the Developer Certificate of Origin (DCO)

Code:

• My code follows the code style of this project.
• I have added tests to cover my changes.

Docs:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[alexellis]

I didn't see the explicit dependencies mentioned that were needed for minimal RHEL-like OSes?

[alexellis]