Add Azure SKU Gateway and RUs environment variables

[gonzalogarciajaubert]

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[what-the-diff]

PR Summary

• Update of Max Throughput Constants
  In constants.ts, we've increased the default maximum throughput for both containers and databases to 1000. This means that these services can handle more data simultaneously, potentially improving speed and efficiency.

• Implementation of Service Plan Constant
  The variable basicServicePlan used in application-synth.ts file has been replaced with a constant value BASIC_SERVICE_PLAN. This improves readability and maintainability, as it gives the value a clear, consistent meaning across the program.

• Integration of Web Application Firewall (WAF) Constant
  We've included a new constant USE_WAF in terraform-application-gateway.ts. This value decides the type of SKU (stock keeping unit) and whether a Web Application Firewall configuration should be included in the gateway configuration. This can enhance the security of your application gateway.

• Documentation Updates on Azure Service Plan and Application Gateway SKUs
  Connections with Azure are now more flexible, thanks to added support in data-migrations.md and introduction of two new environment variables. It's now possible to use different versions of the Azure App Service Plan and Application Gateway SKUs in Booster.

• Change of Infrastructure Default Values
  In the infrastructure-providers.mdx file, the default values for the maximum throughput of containers and databases on Azure were also raised to 1000. This synchronization with the constant updates helps keep the software's performance consistent across different components.

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