perf(cli): optimize CPU consumption of help pages (#9607)

This change reduces the CPU consumption of --help by ~50%.

Also, this change removes ANSI escape codes from our golden files. I
don't think those were worth the inability to parallelize golden file tests and
global state fragility.

enterprise/cli/testdata/coder_groups_edit_--help.golden

@@ -1,24 +1,24 @@
 coder v0.0.0-devel
 
-USAGE:
+USAGE:
   coder groups edit [flags] <name>
 
   Edit a user group
 
-OPTIONS:
-  -a, --add-users string-array
+OPTIONS:
+  -a, --add-users string-array
           Add users to the group. Accepts emails or IDs.
 
-  -u, --avatar-url string
+  -u, --avatar-url string
           Update the group avatar.
 
-      --display-name string, $CODER_DISPLAY_NAME
+      --display-name string, $CODER_DISPLAY_NAME
           Optional human friendly name for the group.
 
-  -n, --name string
+  -n, --name string
           Update the group name.
 
-  -r, --rm-users string-array
+  -r, --rm-users string-array
           Remove users to the group. Accepts emails or IDs.
 
 ———