Simplify the tool's backend API

[mark-meyer]

• The original backen API presented several parameters that were always static values. The made it possible to send requests to SAM.gov beyond the intended use of the tool. This removes those remove static parameters from the api and provides them directly to te SAM api on the backend. This simplified the api presented by the tool and reduces the amount of the sam api it exposes.
• fix some validation in the form and validate the length of input.
• Experiment with GCP settings to prevent it from spawning new instances because the SAM api calls have have fairly high latency. This will likely require more load testing and adjustments.