ref(node-core): Add more specific mechanism.type to worker thread errors from childProcessIntegration

[Lms24]

Sets a more specific mechanism type. The main problem here is that I didn't find a suiting category to be used with trace origin. So I decided to go with a similar format but the category doesn't match an existing cat.

ref #17260

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	9,048	-	9,109	-1%
GET With Sentry	1,175	13%	1,225	-4%
GET With Sentry (error only)	5,723	63%	5,775	-1%
POST Baseline	1,153	-	1,143	+1%
POST With Sentry	450	39%	451	-0%
POST With Sentry (error only)	1,020	88%	991	+3%
MYSQL Baseline	3,175	-	3,325	-5%
MYSQL With Sentry	375	12%	444	-16%
MYSQL With Sentry (error only)	2,623	83%	2,720	-4%

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