Improve authentication tests

[khansaad]

Describe the feature

Bearer authentication tests have been added as part of PR #1307 . Need to improve that by :

• invoking some code that makes use of the token along with checking the pod log
• need to check how to simulate expired token as currently it's same as invalid token

Examples or references

These are the current test scenarios mentioned in the script which needs improvement :
tokens=(
["valid"]="/var/run/secrets/kubernetes.io/serviceaccount/token"
["expired"]="EXPIRED_TOKEN"
["invalid"]="/var/run/secrets/kubernetes.io/serviceaccount/token2"
["empty"]=""
)

Suggest a solution

TBU

Any suggestions on how to solve this

Additional Context

Any additional context about the feature