[ansible/artifactory_nginx] Refactoring of the artifactory_nginx role

[EmptyByte]

…up is now optional.

PR Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• Title of the PR starts with installer/product name (e.g. [ansible/artifactory])
• Variables and other changes are documented in the README.md
• CHANGELOG.md updated

What this PR does / why we need it:
This PR makes the NGINX repositories setup optional. A user now needs to set the variable artifactory_nginx_setup_repos to true when they want to install/configure the NGINX official repositories. Otherwise, it does not. By default, NGINX is available in the RHEL repositories (refer to: Red Hat documentation ).

The main advantage is that we do not configure additional repositories unless requested, making it more idempotent and following user choices. Other enhancements include modularity changes and the use of distribution-based variables. This update also deprecates the artifactory_nginx_ssl role, as the new role will handle both situations.

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #

Special notes for your reviewer:
Please review the changes related to the optional NGINX repository setup and the deprecation of the artifactory_nginx_ssl role. This role was not yet tested/linted and some minor correct might be required.

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[EmptyByte]

Will rework both nginx and postgresql.