refactor: Consolidate copilot server executable path logic #86

Job	Run time
test (ubuntu-latest, 27.2, false)	37s
test (ubuntu-latest, 28.2, false)	38s
test (ubuntu-latest, 29.3, false)	48s
test (macos-latest, 27.2, false)	51s
test (macos-latest, 28.2, false)	1m 16s
test (macos-latest, 29.3, false)	1m 23s
test (windows-latest, 27.2, false)	1m 6s
test (windows-latest, 28.2, false)	1m 9s
test (windows-latest, 29.3, false)	1m 8s
test (ubuntu-latest, snapshot, true)	34s
test (macos-latest, snapshot, true)	1m 14s
	10m 44s

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