Remove: BillingPlan hardcoded constant

[ItzNotABug]

What does this PR do?

Removes the hardcoded checks.

Test Plan

N/A.

Related PRs and Issues

• Billing SDK Refactor #2722

Have you read the Contributing Guidelines on issues?

Yes.

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Project ID: 688b7bf400350cbd60e9

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[lohanidamodar]

Gone through probably 30% of the files
looks generally good.
Let's also make sure to replace organization.billingPlan with organization.billingPlanId so that later migration is easier .