Break apdex down into components for all prometheus source SLIs

Andrew Newdigaterequested to merge
apdex-components-for-all-source-metrics into master

In !3300 (comment 522973878), we broke apdex calculation down into its components, for better aggregation and calculation over time.

As a risk mitigation, we initially only did this for 1m burn rates which are not used in our SLO monitoring.

In !3300 (merged), I confirmed that this approach is working well.

This rolls the change out to all source metrics.

Having this in place will allow us to calculate our total monthly availability for rolling 30d periods much faster.

cc @rnienaber @marin

Edited by Andrew Newdigate

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