Verify JWT Auth configuration

[rohank07]

Verify user is able to authenticate with JWT token in namespace and connect to trino. Running select current_user; should return user namespace name.

Confirm following senarios:

• curl with valid token -> run any query at all
• same curl with invalid or no token -> denied access
• curl with unencrypted HTTP and valid token -> denied access
• curl with valid token, ask for different user -> denied
• curl with "alg":"none"

[rohank07]

1. curl with valid token -> run any query at all ✔️
   Able to authenticate successfully connecting to trino using --user default (local cluster default service account: "sub": "system:serviceaccount:default:default"
2. No token provided ✔️
   
3. unencrypted HTTP --server http://trino.example.com ✔️
   
4. curl with valid token, ask for different user ✔️
   
5. "alg":"none" :heavy_check_mark ✔️
   

[rohank07]

Trino Coordinator pod would keep going to crashloopbackoff. Viewed the logs of the pod and noticed Trino complaining about missing shared secret and needs internal authentication configuration property. All nodes required internal-communication.shared-secret=<secret>