[roll] Roll fuchsia [bazel] Add host tests for json_validator_valico

This CL adds three small host Bazel tests for the json_validator_valico
program, that is already built with Bazel. The GN tests are not removed
yet, since Bazel host tests are still not visible to `fx test` and
infra.

This demonstrates how to use the new host_test() Bazel rule to define
a series of tests using the same binary with different arguments, and
how to locate data files using a runfiles library.

- json_validator_valico_test.py: A test wrapper Python script that
  runs the tool against a test schema and a test document and
  verifies whether it succeeds or fails.

  This uses a Python runfiles library to locate the test's runtime
  dependencies, following Bazel test conventions.

- defs.bzl: Add a macro to define a py_test() target that runs the
  tool against fixed test schemas and documents, invoking
  json_validator_valico_test.py.

- BUILD.bazel: Add three new tests, and a test_suite() that is
  reference from //build/bazel/host_tests/BUILD.bazel

Testing manually with:

```
fx bazel test --config=host //build/tools/json_validator/test:tests
```

Or by building then invoking one of the test directly:

```
fx build --host @//build/tools/json_validator/test:tests
bazel-bin/build/tools/json_validator/test/json_validator_valico_base_test
```

Original-Bug: 349341932
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1511236
Original-Revision: cfa3dab89e820e9dde45e0c488fb795f97507613
GitOrigin-RevId: 2f1a1e30cfd99b7c3cf9699b6b15ee3b6cfc9a65
Change-Id: I723b37c93a2b2282547851ed51f1d78a92fd7fac