Added utilities for creating custom prometheus metrics (#21614) #1763

Job	Run time
Setup	1m 47s
Lint	50s
i18n	35s
Admin tests - Chrome	0s
Database tests (Node 18.12.1, mysql8)	6m 18s
Performance tests	0s
Database tests (Node 20.11.1, mysql8)	6m 12s
Regression tests (Node 20.11.1, mysql8)	2m 57s
Unit tests (Node 18.12.1)	1m 0s
Regression tests (Node 20.11.1, sqlite3)	1m 54s
Database tests (Node 20.11.1, sqlite3)	3m 28s
Unit tests (Node 20.11.1)	1m 0s
Admin-X Settings tests	0s
Comments-UI tests	0s
Ghost-CLI tests	4m 14s
Signup-form tests	0s
Browser tests	5m 59s
Publish @tryghost/admin-x-activitypub	41s
All required tests passed or skipped	1s
Coverage	0s
Canary	0s
	36m 56s

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