Refactor builder bridge #1875

Job	Run time
CLI responsiveness with latest Python	1m 59s
Downstream builds with Python 3.8	39s
Python 3.8 on Linux	2m 44s
Downstream builds with Python 3.9	41s
Python 3.9 on Linux	2m 42s
Downstream builds with Python 3.10	39s
Python 3.10 on Linux	2m 50s
Downstream builds with Python 3.11	37s
Python 3.11 on Linux	2m 36s
Downstream builds with Python 3.12	41s
Python 3.12 on Linux	3m 14s
Python 3.8 on Windows	6m 5s
Python 3.9 on Windows	6m 1s
Python 3.10 on Windows	5m 59s
Python 3.11 on Windows	6m 51s
Python 3.12 on Windows	6m 3s
Python 3.8 on macOS	3m 24s
Python 3.9 on macOS	3m 11s
Python 3.10 on macOS	3m 21s
Python 3.11 on macOS	3m 49s
Python 3.12 on macOS	4m 13s
Report coverage	38s
check	4s
	1h 9m 1s

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