Use conda libmamba solver to resolve intermittent libarchive issue [skip ci]

[pxLi]

To fix an intermittent issue while using mamba to download conda pkgs

[2023-09-12T19:23:51.693Z] Traceback (most recent call last):
[2023-09-12T19:23:51.693Z]   File "/opt/conda/bin/mamba", line 7, in <module>
[2023-09-12T19:23:51.693Z]     from mamba.mamba import main
[2023-09-12T19:23:51.693Z]   File "/opt/conda/lib/python3.11/site-packages/mamba/mamba.py", line 49, in <module>
[2023-09-12T19:23:51.693Z]     import libmambapy as api
[2023-09-12T19:23:51.693Z]   File "/opt/conda/lib/python3.11/site-packages/libmambapy/__init__.py", line 7, in <module>
[2023-09-12T19:23:51.693Z]     raise e
[2023-09-12T19:23:51.693Z]   File "/opt/conda/lib/python3.11/site-packages/libmambapy/__init__.py", line 4, in <module>
[2023-09-12T19:23:51.693Z]     from libmambapy.bindings import *  # noqa: F401,F403
[2023-09-12T19:23:51.693Z]     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[2023-09-12T19:23:51.693Z] ImportError: libarchive.so.13: cannot open shared object file: No such file or directory

Previously we fixed the same issue in #8728 by hardcode mamba version,
But it started again recently. It should still be related to the mamba being incompatible w/ newer conda,
so as suggested by conda team, we decided to use conda-libmamba-solver which should be guaranteed w/o any compatibility issue.

Verified in internal ENVs

[pxLi]

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