Delete RGByResource map

[gabesaba]

What type of PR is this?

/kind cleanup
/hold (prefer #2486 to merge first)

What this PR does / why we need it:

Simplifies logic. Before, we risk these data structures falling out of sync.

Preliminary change for #79

Special notes for your reviewer:

Does this PR introduce a user-facing change?

NONE

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[gabesaba]

/cc @macsko

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[macsko]

Looks good

[gabesaba]

/close in favor of #2519