The "token" get from the request header, but we don't use it.

[Hongten]

Description:
The "token" get from the request header, but we don't use it.

Environment:

1. apache-pulsar-manager version is 0.3.0,
2. JDK: 11
3. OS: macOS

Scenario:
Please refer to https://github.com/apache/pulsar-manager/blob/master/src/main/java/org/apache/pulsar/manager/controller/EnvironmentsController.java#L106

Advise:
We can remove the "token" as we don't use it.

I wish to fix this issue.
Thanks.