Fix: Map missing WARNING-state

[sva-mh]

General information

Then SAP-Hana disk-usage-checks did not map the SAP-WARNING state to CMK-Warn.
As result SAP-WARN lead to a CRIT-Ticket. This lead to creation of non-necessary on-call tickets.

Bug reports

This was observed in CMK 2.3 already and the behaviour was not changed since then.

This available states delivered by the database-query are provided are documented here:

https://github.com/SAP-archive/sap-hana-cloud-hana-database/blob/main/docs/sql-ref/020-System-Views-Reference/022-Monitoring-Views/m-system-overview-system-view-20c61f0.md

Note: I did not change then "UNKNOWN"-mapping although it is not documented, since it does not harm
and may have been seen on other/older SAP-setups.

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[sva-mh]

I have read the CLA Document and I hereby sign the CLA or my organization already has a signed CLA.