fix(core): Emit processed metric

[chargome]

We were emitting the non-processed metric in the hook before – I changed this behaviour + added a test to verify.

[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.
⚠️ Warning: Base artifact is not the latest one, because the latest workflow run is not done yet. This may lead to incorrect results. Try to re-run all tests to get up to date results.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	8,619	-	8,592	+0%
GET With Sentry	1,325	15%	1,337	-1%
GET With Sentry (error only)	5,962	69%	6,047	-1%
POST Baseline	1,167	-	1,193	-2%
POST With Sentry	494	42%	507	-3%
POST With Sentry (error only)	1,043	89%	1,031	+1%
MYSQL Baseline	3,237	-	3,330	-3%
MYSQL With Sentry	445	14%	410	+9%
MYSQL With Sentry (error only)	2,654	82%	2,700	-2%

View base workflow run