Move account process to main SAR template

[sbkok]

Why?

The SAR does not understand local references as introduced by the src/account_processing.yml unfortunately.

What?

After investigating several options, the only option that was accepted was to move the logic inside the main template instead. The references are updated to use the ones available in the main template directly.

Additionally, the ARN references are updated to include the partition correctly.

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[StewartW]

Makes sense. Shame that sam publish and sam deploy have different reactions to this :(

[sbkok]

(Rebased on the latest commit in master to resolve a conflict)

[sbkok]

@javydekoning and @StewartW, I had to resolve a merge conflict. Unfortunately that dismissed the review approvals.