feat(cli): add --no-build flag to state push for state-only updates (#21374)

## Summary

Adds a `--no-build` flag to `coder state push` that updates the
Terraform state directly without triggering a workspace build.

## Use Case

This enables state-only migrations, such as migrating Kubernetes
resources from deprecated types (e.g., `kubernetes_config_map`) to
versioned types (e.g., `kubernetes_config_map_v1`):

```bash
coder state pull my-workspace > state.json
terraform init
terraform state rm -state=state.json kubernetes_config_map.example
terraform import -state=state.json kubernetes_config_map_v1.example default/example
coder state push --no-build my-workspace state.json
```

## Changes

- Add `PUT /api/v2/workspacebuilds/{id}/state` endpoint to update state
without triggering a build
- Add `UpdateWorkspaceBuildState` SDK method
- Add `--no-build`/`-n` flag to `coder state push`
- Add confirmation prompt (can be skipped with `--yes`/`-y`) since this
is a potentially dangerous operation
- Add test for `--no-build` functionality

Fixes #21336

codersdk/workspacebuilds.go

@@ -188,6 +188,28 @@ func (c *Client) WorkspaceBuildState(ctx context.Context, build uuid.UUID) ([]by
 	return io.ReadAll(res.Body)
 }
 
+// UpdateWorkspaceBuildStateRequest is the request body for updating the
+// provisioner state of a workspace build.
+type UpdateWorkspaceBuildStateRequest struct {
+	State []byte `json:"state"`
+}
+
+// UpdateWorkspaceBuildState updates the provisioner state of the build without
+// triggering a new build. This is useful for state-only migrations.
+func (c *Client) UpdateWorkspaceBuildState(ctx context.Context, build uuid.UUID, state []byte) error {
+	res, err := c.Request(ctx, http.MethodPut, fmt.Sprintf("/api/v2/workspacebuilds/%s/state", build), UpdateWorkspaceBuildStateRequest{
+		State: state,
+	})
+	if err != nil {
+		return err
+	}
+	defer res.Body.Close()
+	if res.StatusCode != http.StatusNoContent {
+		return ReadBodyAsError(res)
+	}
+	return nil
+}
+
 func (c *Client) WorkspaceBuildByUsernameAndWorkspaceNameAndBuildNumber(ctx context.Context, username string, workspaceName string, buildNumber string) (WorkspaceBuild, error) {
 	res, err := c.Request(ctx, http.MethodGet, fmt.Sprintf("/api/v2/users/%s/workspace/%s/builds/%s", username, workspaceName, buildNumber), nil)
 	if err != nil {