Add fallback command for micromamba

[bentsherman]

Close #4161

Tested with micromamba image:

$ docker run --rm -it mambaorg/micromamba:1.4.9 -- bash
(base) $ command -v conda && (conda info --json | awk '/conda_prefix/ { gsub(/"|,/, "", $2); print $2 }') || (micromamba info | grep "env location :" | cut -d : -f 2)
 /opt/conda

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[jemma-nelson]

Note that this PR only addresses the micromamba info invocation in point 2 of this comment:
#4161 (comment)

Another change would required to address point 1, the micromamba create --yes flag.

(I'm neutral on how y'all handle this, just want to make sure its clear).

[pditommaso]

We are going to deprecate the support for Micromamba #4464. Therefore closing w/o merging

[ewels]

Reopening, as not sure we should remove Mamba just yet, at least until conda/conda#13037 is solved.

[pditommaso]

@jorgee avoid the fallback approach can be a mess to debug, there should be a separate command when the micromamba flag is set

[jorgee]

@jorgee avoid the fallback approach can be a mess to debug, there should be a separate command when the micromamba flag is set

I have pushed new changes with this modification. I think it is ready