remove last use of the apply graph Destroy flag!

The apply graph builder no longer uses the destroy flag, which is not
always known since the destroy flag is not stored in the plan file.

terraform/context.go

@@ -277,7 +277,6 @@ func (c *Context) Graph(typ GraphType, opts *ContextGraphOpts) (*Graph, tfdiags.
 			Components: c.components,
 			Schemas:    c.schemas,
 			Targets:    c.targets,
-			Destroy:    c.destroy,
 			Validate:   opts.Validate,
 		}).Build(addrs.RootModuleInstance)
 

terraform/graph_builder_apply.go

@@ -40,9 +40,6 @@ type ApplyGraphBuilder struct {
 	// outputs should go into the diff so that this is unnecessary.
 	Targets []addrs.Targetable
 
-	// Destroy, if true, represents a pure destroy operation
-	Destroy bool
-
 	// Validate will do structural validation of the graph.
 	Validate bool
 }

terraform/graph_builder_apply_test.go

@@ -468,7 +468,6 @@ func TestApplyGraphBuilder_provisionerDestroy(t *testing.T) {
 	}
 
 	b := &ApplyGraphBuilder{
-		Destroy:    true,
 		Config:     testModule(t, "graph-builder-apply-provisioner"),
 		Changes:    changes,
 		Components: simpleMockComponentFactory(),