Draft: Add Full & Partial Reconciliation Interval From Rails To Agent

Issue - #460416 (comment 1900197534)+

What does this MR do and why?

We add in validation on full & partial interval seconds, making sure no invalid data is leak into all downstreamings. This is down in the settings module.

Also we pass in those 2 envs from settings into reconcilation flow, and send them to agent via our API.

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Before this, there is no validation on instance vars, which means the user could set potentially any values, which will cause other issues later

Success Case

Incorrect input values, validation fails

Negative or Zero Full Interval

Negative or Zero Partial Interval

Partial greater or equal than Full

Full MR local test. We could see the new two fields are included into the response payload

When there is validation error with either fields, there would be runtime error raised, and no reconciliation happen

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