Werk #11387: mssql.vbs: Improved performance of backup fetching

Component	Checks & agents
Title	mssql.vbs: Improved performance of backup fetching
Date	May 26, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

In some cases fetching the backup states took a long time. This has been improved massively by this change.

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