Move throttling of request processing from middleware to rate limiter setup

[shalarewicz]

Summary

Moves throttling request processing to rate limiter setup to ensure all rate limiters are throttled and not just that of the express middleware.

Type of Change

Please delete options that are not relevant.

• [x] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [x] This change requires a documentation update

Issues

• N/A

Evidence

• All tests continue to pass as expected.

[shalarewicz]

Addressed requested changes. Tests continue to pass.