Aggressive parameter elimination in CDK

[mitchdenny]

See the following Aspire PR:

dotnet/aspire#2635

Currently CDK when generating Bicep will remove parameters from the generated Bicep if they are not referenced in the model (in a way it can track). However a parameter may be referenced as part of an expression, or may be required as part of a contract (such in the case of Aspire + AZD).

Parameter elimination in generated Bicep should either be disabled, or have an option to be disabled either at the construct level or on a per parameter level.