Werk #15953: Support same graph multiple times in views

Component	Metrics system
Title	Support same graph multiple times in views
Date	Jun 23, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Before this werk, when adding the same graph multiple times to a view, only one of the graphs was actually rendered. The other ones were displayed as empty frames.

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