fix(tools): Upgrade shell detection & simplify autocompletion

Explicitly set shell type in export.sh for bash and zsh

-Most of the issues reported with the updated export scripts are related
 to shell detection. Since we already know the shell type for commonly
 used ones like bash or zsh, we can pass the shell type directly to the
 activate script. This should hopefully resolve the shell detection
 problems for most users.

 This update also modifies the shell type detection to rely solely on
 psutil.Process().cmdline() rather than psutil.Process().exe(). This
 change aims to resolve permission issues that may occur if, for example,
 the Python binary has certain capabilities assigned.

Move shell completion to the init script

- Currently we are expanding the autocompletion in the activate script and
 adding the expanded commands into the init script. To avoid
 concerns about shell versions, move the entire expansion to the init
 script.

export.sh

@@ -19,15 +19,19 @@ fi
 # Attempt to identify the ESP-IDF directory
 idf_path="."
 
+shell_type="detect"
+
 # shellcheck disable=SC2128,SC2169,SC2039,SC3054,SC3028 # ignore array expansion warning
 if test -n "${BASH_SOURCE-}"
 then
     # shellcheck disable=SC3028,SC3054 # unreachable with 'dash'
     idf_path=$(dirname "${BASH_SOURCE[0]}")
+    shell_type="bash"
 elif test -n "${ZSH_VERSION-}"
 then
     # shellcheck disable=SC2296  # ignore parameter starts with '{' because it's zsh
     idf_path=$(dirname "${(%):-%x}")
+    shell_type="zsh"
 elif test -n "${IDF_PATH-}"
 then
     idf_path=$IDF_PATH
@@ -46,7 +50,7 @@ fi
 . "${idf_path}/tools/detect_python.sh"
 
 # Evaluate the ESP-IDF environment set up by the activate.py script.
-idf_exports=$("$ESP_PYTHON" "${idf_path}/tools/activate.py" --export)
+idf_exports=$("$ESP_PYTHON" "${idf_path}/tools/activate.py" --export --shell $shell_type)
 eval "${idf_exports}"
 unset idf_path
 return 0