Summary:
https://phorge.dev.yugabyte.com/D38836 only added the prometheus scrape timeout to YBA installer
deployments. This diff exposes both scrape timeout and scrape interval as values that user can
configure, which will then be reflected in prometheus.yml.

Test Plan: Deploy k8s and update scrapte timeout/interval

Reviewers: anijhawan, dshubin

Reviewed By: dshubin

Subscribers: amalyshev, yugaware

Differential Revision: https://phorge.dev.yugabyte.com/D39020