test: add mikan client login test

Cargo.lock

@@ -3959,6 +3959,15 @@ version = "0.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "16cf681a23b4d0a43fc35024c176437f9dcd818db34e0f42ab456a0ee5ad497b"
 
+[[package]]
+name = "nanoid"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3ffa00dec017b5b1a8b7cf5e2c008bfda1aa7e0697ac1508b491fdf2622fb4d8"
+dependencies = [
+ "rand 0.8.5",
+]
+
 [[package]]
 name = "native-tls"
 version = "0.2.14"
@@ -5152,6 +5161,7 @@ dependencies = [
  "maplit",
  "mockito",
  "moka",
+ "nanoid",
  "once_cell",
  "opendal",
  "openidconnect",