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Add Copilot instructions for FFs, and update documentation more generally #9417

Job	Run time
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.25.6)	1m 25s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.24.3)	1m 28s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.20.7)	1m 30s
Go: tracing with legacy workflow (ubuntu-latest, default)	1m 12s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.23.9)	1m 21s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.21.4)	1m 24s
Go: tracing with legacy workflow (macos-latest, linked)	7m 12s
Go: tracing with legacy workflow (ubuntu-latest, stable-v2.22.4)	1m 16s
Go: tracing with legacy workflow (ubuntu-latest, nightly-latest)	1m 14s
Go: tracing with legacy workflow (macos-latest, nightly-latest)	8m 10s
Go: tracing with legacy workflow (ubuntu-latest, linked)	1m 8s
	27m 20s