fix(deploy) rework serviceaccount token

[rainest]

What this PR does / why we need it:
Followup to #2612, see rationale in Kong/charts#621

E2E: https://github.com/Kong/kubernetes-ingress-controller/actions/runs/2579532384

[shaneutt]

This go merged through a failure of the feature gates integration tests:

https://github.com/Kong/kubernetes-ingress-controller/runs/7102294420?check_suite_focus=true

=== RUN   TestValidationWebhook/a_consumer_with_an_invalid_credential_type_should_fail_validation
time="2022-06-28T22:48:52Z" level=error msg="failed to run validation" component=admission-server error="Secret \"junklawnmowercreds\" not found"
    webhook_test.go:499: 
        	Error Trace:	webhook_test.go:499
        	Error:      	Should be true
        	Test:       	TestValidationWebhook/a_consumer_with_an_invalid_credential_type_should_fail_validation
        	Messages:   	got error string "Internal error occurred: failed calling webhook \"validations.kong.konghq.com\": failed to call webhook: an error on the server (\"Secret \\\"junklawnmowercreds\\\" not found\") has prevented the request from succeeding", want a superstring of "invalid credential type"

I've updated the repository settings so this check is required going forward.

the same test then passed on main so perhaps this was a flake? https://github.com/Kong/kubernetes-ingress-controller/runs/7102887332?check_suite_focus=true