Werk #18365: OTel collector: fixed missing validation step when submitting form

Component	Setup
Title	OTel collector: fixed missing validation step when submitting form
Date	Nov 27, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.4.0p17 Checkmk Ultimate, Checkmk Cloud, Checkmk Ultimate MT

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