[Setup] Not skipping conda init (#2909)

* Revert changes for skipping `conda init`

* avoid dev/null

sky/skylet/constants.py

@@ -74,12 +74,9 @@
     'which conda > /dev/null 2>&1 || '
     '(wget -nc https://repo.anaconda.com/miniconda/Miniconda3-py310_23.5.2-0-Linux-x86_64.sh -O Miniconda3-Linux-x86_64.sh && '  # pylint: disable=line-too-long
     'bash Miniconda3-Linux-x86_64.sh -b && '
-    'eval "$(~/miniconda3/bin/conda shell.bash hook)" && conda init && '
+    'eval "$(~/miniconda3/bin/conda shell.bash hook)" && '
     'conda config --set auto_activate_base true); '
-    # Only run `conda init` if the conda is not installed under /opt/conda,
-    # which is the case for VMs created on GCP, and running `conda init` will
-    # cause error and waiting for the error to be reported: #2273.
-    'which conda | grep /opt/conda || conda init > /dev/null;')
+    'grep "# >>> conda initialize >>>" ~/.bashrc || conda init;')
 
 # The name for the environment variable that stores SkyPilot user hash, which
 # is mainly used to make sure sky commands runs on a VM launched by SkyPilot