cquery --output=proto: include more dependencies in `configured_rule_…

…input`

This is an iteration of bazelbuild/bazel#15038. That PR added the concept of `configured_rule_input`, where `--output=proto` rules include both the labels and configurations of their dependencies.

That used `CqueryTransitionResolver` to find the dependencies. `CqueryTransitionResolver` does this by directly querying the Skyframe graph. However, cquery's view of the graph doesn't directly match the Skyframe graph.

For example, cquery doesn't explicitly list aspects: if CT `//foo` depends on aspect A which has an implicit dep on CT `//bar`, the Skyframe graph shows `//foo -> A -> //bar`.

Since cquery can't directly show `A` (see [More accurate cquery](https://docs.google.com/document/d/1x-RqFFEcGIzVgtYHIq6s6Qt4vYtJWz3nuHIuqeI89dU/edit#heading=h.5mcn15i0e1ch)), cquery instead shows `//foo -> //bar`.

For any cquery use we want to use cquery's interpretation of the graph as a consistent source of truth. This change refactors `--output=proto` to do that.

This means, for example, that `cquery --output=proto` will now have `configured_rule_input` entries  for deps like `//bar`. Before this change there's no way to tell where the dependency on `//bar` comes from.

Also correctly includes aliases (doesn't dereference them as either outputs or `configured_rule_input` entries of other outputs).

Also updates the API contract for `configured_rule_input`. Before, "same configuration" deps had their configuration fields omitted. Now they're always included, except for source files which have no configuration.

PiperOrigin-RevId: 621245620

third_party/bazel/src/main/protobuf/build.proto

@@ -338,9 +338,16 @@ message Rule {
   repeated string definition_stack = 14;
 }
 
+// Direct dependencies of a rule in <depLabel, depConfiguration> form.
 message ConfiguredRuleInput {
+  // Dep's target label.
   optional string label = 1;
+  // Dep's configuration if the dep isn't a source file, else unset.
   optional string configuration_checksum = 2;
+  // Reference to this dep's configuration if --proto:include_configurations is
+  // set: see
+  // https://github.com/bazelbuild/bazel/blob/7278be3f9b0c26842ecb8225f0215c1e4aede5a9/src/main/protobuf/analysis_v2.proto#L189.
+  // If this dep is a source file, this is unset.
   optional uint32 configuration_id = 3;
 }