Auto generated release for bzl-gen-build

Fix apply_binaries for Google3 (#243)

**Problem**
When using `--no-aggregate-source` option with py_binary,
I noticed that we end up generating py_binary twice,
first time for main, and second time for test.

**Solution**
This implements `TargetEntries::combine(ts1, ts2)`, which
can dedupliate the target entries based on the name.
There's an example in `examples/com` demonstrating the usage.