Update BUILD and bazelrc for Bazel 9 based clients (#6218)

* Add load statements for build rules which used to be loaded automatically untill Bazel 8.x
* Use `--extra_toolchains` instead of `--cc_proto_library_header_suffixes` as this seem to have stopped working since `--incompatible_enable_proto_toolchain_resolution` is flipped to always on.
* Set `--incompatible_enable_proto_toolchain_resolution` so that clients on Bazel 8.x do not fail on  `--extra_toolchains`.


Tested by running extraction over Bazel and Gvisor's repo.

Fix multiple corpora issue by defaulting to simple_vnames.json (#6207)

* Fix multiple corpora issue by defaulting to simple_vnames.json

* Fix multiple corpora issue by defaulting to simple_vnames.json

release: v0.0.73 (#6195)

release: v0.0.72 (#6183)

[fix] Correct source_file inclusion in rust extractor (#6177)

Previously, source file entries were polluted in the cache that speeds
up directory traversal. Instead of putting only a single directory's
source files in the cache, we were entering the source files for
(potentially) the entire crate.

Fix: only store source files for the current directory, not the whole
crate.

Test: proved that Fuchsia's corpus has no more errors like
"source_file does not have a required_input entry"

Add rust extractor to release, cut a new release (#6174)

* fix(bazel): add rust extractor to release

Forgot this step when adding a new extractor.

* release: v0.0.70

indexer/proto: correctly visit oneof (#6161)

See
https://github.com/protocolbuffers/protobuf/blob/main/docs/implementing_proto3_presence.md#to-iterate-over-all-oneofs
for more info.

This helps silencing some error within simple proto3 files

```
syntax = "proto3";

package moo;

message Bar {
  ...
  map<int32, int32> foo = 12;
}
```

which would yield
```
file_descriptor_walker.cc:262] Unexpected location vector [] while walking moo.proto
```

before this change.

Co-authored-by: Varun Mahajan <varun.mah@gmail.com>

fix(bazel): remove cyclic dependency by removing usage of assign_exte…

…rnal_projects_to_separate_corpora config_setting flag (#6146)

Usage of assign_external_projects_to_separate_corpora along with select statement is causing a cyclic dependency for Bazel 8. Also not usage of flag assign_external_projects_to_separate_corpora was found hence deprecating the flag. The flag was initially introduced for backward compatibility in https://source.corp.google.com/h/github/kythe/kythe/+/3966e3f7aa790a61645e6babf511f7ae21b78011.

Tested by executing bazelisk --bazelrc=$KYTHE_RELEASE_DIR/extractors.bazelrc build //src:bazel which succeeded.

release: v0.0.67 (#6058)

release: v0.0.66 (#6020)

#### Bug Fixes

*   remove slog Context log calls (#6018) ([2589380](2589380))

#### Features

* **java_indexer:**  support more metadata types (#6017) ([28cf670](28cf670))