Use referenced resource name for suffix-only reference fields

[visit1985]

Issue #, if available:

aws-controllers-k8s/community#2173
As suggested in #721 (comment)

Description of changes:

Use the referenced resource name as the reference-field prefix when the source field name consists of an identifier suffix only and added WAFv2 test coverage for this.

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[ack-prow]

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This pull-request has been approved by: visit1985
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[ack-prow]

Hi @visit1985. Thanks for your PR.

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