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.

cli/testdata/coder_--help.golden

@@ -1,6 +1,6 @@
 coder v0.0.0-devel
 
-USAGE:
+USAGE:
   coder [global-flags] <subcommand>
 
   Coder v0.0.0-devel — A tool for provisioning self-hosted development
@@ -13,7 +13,7 @@ coder v0.0.0-devel
   
        $ coder templates init
 
-SUBCOMMANDS:
+SUBCOMMANDS:
     config-ssh        Add an SSH Host entry for your workspaces "ssh
                       coder.workspace"
     create            Create a workspace
@@ -49,42 +49,42 @@ coder v0.0.0-devel
     users             Manage users
     version           Show coder version
 
-GLOBAL OPTIONS: 
+GLOBAL OPTIONS: 
 Global options are applied to all commands. They can be set using environment
 variables or flags.
 
-      --debug-options bool
+      --debug-options bool
           Print all options, how they're set, then exit.
 
-      --disable-direct-connections bool, $CODER_DISABLE_DIRECT_CONNECTIONS
+      --disable-direct-connections bool, $CODER_DISABLE_DIRECT_CONNECTIONS
           Disable direct (P2P) connections to workspaces.
 
-      --global-config string, $CODER_CONFIG_DIR (default: ~/.config/coderv2)
+      --global-config string, $CODER_CONFIG_DIR (default: ~/.config/coderv2)
           Path to the global `coder` config directory.
 
-      --header string-array, $CODER_HEADER
+      --header string-array, $CODER_HEADER
           Additional HTTP headers added to all requests. Provide as key=value.
           Can be specified multiple times.
 
-      --header-command string, $CODER_HEADER_COMMAND
+      --header-command string, $CODER_HEADER_COMMAND
           An external command that outputs additional HTTP headers added to all
           requests. The command must output each header as `key=value` on its
           own line.
 
-      --no-feature-warning bool, $CODER_NO_FEATURE_WARNING
+      --no-feature-warning bool, $CODER_NO_FEATURE_WARNING
           Suppress warnings about unlicensed features.
 
-      --no-version-warning bool, $CODER_NO_VERSION_WARNING
+      --no-version-warning bool, $CODER_NO_VERSION_WARNING
           Suppress warning when client and server versions do not match.
 
-      --token string, $CODER_SESSION_TOKEN
+      --token string, $CODER_SESSION_TOKEN
           Specify an authentication token. For security reasons setting
           CODER_SESSION_TOKEN is preferred.
 
-      --url url, $CODER_URL
+      --url url, $CODER_URL
           URL to a deployment.
 
-  -v, --verbose bool, $CODER_VERBOSE
+  -v, --verbose bool, $CODER_VERBOSE
           Enable verbose output.
 
 ———