tests: fix failure installing non-existing packages in REQUIRED_PACKAGES
Previously, dnf/yum used to ignore packages that didn't exist. In Fedora 32, dnf starts to fail the entire command: No match for argument: python-gobject-base Error: Unable to find a match: python-gobject-base Since this script is supposed to work with different RHEL/Fedora versions, it's expected that not all packages are available everywhere. Fix that, by installing packages that we know that they might be missing one by one (and ignore the error).
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