Still not applying at the dynamic parameters websocket. The wsbuilder is
the source of truth for previous values, so this is the most accurate
and still will fail in the synchronous api call to build a workspace.
This mirrors how we handle immutable params.
Closes https://github.com/coder/coder/issues/19064
`BuildError` response from `wsbuilder` does not support rich errors from validation. Changed this to use the `Validations` block of codersdk responses to return all errors for invalid parameters.
# What does this do?
This does parameter validation for dynamic parameters in `wsbuilder`. All input parameters are validated in `coder/coder` before being sent to terraform.
The heart of this PR is [`ResolveParameters`](https://github.com/coder/coder/blob/b65001e89c0577199a8e470c138c51e91cf2350c/coderd/dynamicparameters/resolver.go#L30-L30).
# What else changes?
`wsbuilder` now needs to load the terraform files into memory to succeed. This does add a larger memory requirement to workspace builds.
# Future work
- Sort autostart handling workspaces by template version id. So workspaces with the same template version only load the terraform files once from the db, and store them in the cache.
Steven Masley