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Warn when `conda_exe` cannot be identified #1407

Job	Run time
ubuntu, Python 3.8, conda-standalone	5m 35s
ubuntu, Python 3.9, conda-standalone	5m 37s
ubuntu, Python 3.10, conda-standalone-nightly	5m 37s
ubuntu, Python 3.11, micromamba	5m 37s
macos, Python 3.8, conda-standalone-nightly	5m 37s
macos, Python 3.10, micromamba	5m 36s
macos, Python 3.11, conda-standalone	5m 37s
windows, Python 3.8, conda-standalone	5m 29s
windows, Python 3.9, conda-standalone-nightly	5m 29s
windows, Python 3.10, conda-standalone	5m 29s
windows, Python 3.11, conda-standalone-nightly	5m 32s
Canary Build	1s
	1h 1m 16s

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