feat: convert entire CLI to clibase (#6491)

I'm sorry.

cli/testdata/coder_server_create-admin-user_--help.golden

@@ -0,0 +1,32 @@
+Usage: coder server create-admin-user [flags]
+
+Create a new admin user with the given username, email and password and adds it
+to every organization.
+
+Options
+      --email string, $CODER_EMAIL
+          The email of the new user. If not specified, you will be prompted via
+          stdin.
+
+      --password string, $CODER_PASSWORD
+          The password of the new user. If not specified, you will be prompted
+          via stdin.
+
+      --postgres-url string, $CODER_POSTGRES_URL
+          URL of a PostgreSQL database. If empty, the built-in PostgreSQL
+          deployment will be used (Coder must not be already running in this
+          case).
+
+      --raw-url bool
+          Output the raw connection URL instead of a psql command.
+
+      --ssh-keygen-algorithm string, $CODER_SSH_KEYGEN_ALGORITHM (default: ed25519)
+          The algorithm to use for generating ssh keys. Accepted values are
+          "ed25519", "ecdsa", or "rsa4096".
+
+      --username string, $CODER_USERNAME
+          The username of the new user. If not specified, you will be prompted
+          via stdin.
+
+---
+Run `coder --help` for a list of global options.