Werk #18563: Interface services: Use "bit/s" intead of "bits/s" as unit

Component	Checks & agents
Title	Interface services: Use "bit/s" intead of "bits/s" as unit
Date	Aug 21, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p11 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

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