Service Category in TO API uses non-RFC3339 date/time strings

[jagan-parthiban]

Parent Issue: #5911

Breaking down the parent issue #5911 in smaller issues to raise separate, reviewable PRs for each of the services.

Traffic Control components affected:

• Traffic Ops
• Documentation

Current behavior:

Using Deprecated TimeNoMod & TimeLayout

curl -k -X GET -H "Content-Type: application/json" --cookie $mojolicious_id "https://localhost:8443/api/4.1/service_categories?name=demo_app"

{"response":[{"lastUpdated":"2023-03-18 10:55:09+05","name":"demo_app"}]}

Expected behavior:

Using RFC3339 Format

curl -k -X GET -H "Content-Type: application/json" --cookie $mojolicious_id "https://localhost:8443/api/5.0/service_categories?name=demo_app"

{"response":[{"lastUpdated":"2023-03-18T10:55:09+05:30.979849","name":"demo_app"}]}

Steps to reproduce:

Make the above api call to 4.1 version