Allowing ruler replication to be configurable for rules API HA

[emanlodovice]

What this PR does:

Which issue(s) this PR fixes: Fixes #

Checklist

• [ ] Tests updated
• [ ] Documentation added
• [ ] CHANGELOG.md updated - the order of entries should be [CHANGE], [FEATURE], [ENHANCEMENT], [BUGFIX]

[rajagopalanand]

LGTM

[emanlodovice]

@yeya24 @alanprot could you take a look at this?

[alanprot]

I understood the general ideal and LGTM.

I did not reviewed every single line in detail but as its already have 3 approves im good with it.