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Warn when `conda_exe` cannot be identified #1408

Job	Run time
ubuntu, Python 3.8, conda-standalone	7m 18s
ubuntu, Python 3.9, conda-standalone	12m 16s
ubuntu, Python 3.10, conda-standalone-nightly	8m 5s
ubuntu, Python 3.11, micromamba	6m 49s
macos, Python 3.8, conda-standalone-nightly	38m 34s
macos, Python 3.10, micromamba	22m 1s
macos, Python 3.11, conda-standalone	21m 48s
windows, Python 3.8, conda-standalone	17m 58s
windows, Python 3.9, conda-standalone-nightly	22m 45s
windows, Python 3.10, conda-standalone	20m 24s
windows, Python 3.11, conda-standalone-nightly	18m 34s
Canary Build	0s
	3h 16m 32s

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