Propagate the upgrate call to SCC

[jesusbv]

Description

Proxy the zypper migration upgrade call to SCC when the system is BYOS

• Related Issue / Ticket / Trello card:

How to test

• 15 SP3 BYOS instance
• register to RMT 2.19
• add LTSS
• update
• remove LTSS
• migrate to 15 SP4
• registercloudguest -r $LTSS_REGCODE

should work

Change Type

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• Bug Fix (a non-breaking change which fixes an issue)
• New Feature (a non-breaking change which adds new functionality)
• Documentation Update (a change which only updates documentation)

Checklist

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• I have reviewed my own code and believe that it's ready for an external review.
• I have provided comments for any hard-to-understand code.
• I have documented the MANUAL.md file with any changes to the user experience.
• If my changes are non-trivial, I have added a changelog entry to notify users at package/obs/rmt-server.changes.

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