Werk #15730: add proper error message when fetch remote call times out

Component	Dynamic host configuration
Title	add proper error message when fetch remote call times out
Date	May 11, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0b8 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Prior to this werk, Phase 1.1 "Fetching from site" reported an Internal Server Error alongside the API specific exception whenever the remote call timed out. This werk introduces proper error handling for this exception and will display the appropriate message instead of the internal error.

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