Add AppJsonLogger warning message when Ubuntu version is not found for CVS for Container Scanning

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Proposal

As discussed here, we should add a Gitlab::AppJsonLogger warning message when the given version of ubuntu is not found:

[version, version.delete_suffix('-ESM')].each do |ver|
  return ver if UBUNTU_VERSIONS.include?(ver)
end

Gitlab::AppJsonLogger.warn(class: self.class.name,
  message: "Ubuntu version not found",
  version: version)

version

We can then set up some type of monitoring for this warning message, to alert us that we need to update the UBUNTU_VERSIONS set.

/cc @johncrowley @thiagocsf