Coverage report started failing

We get the following error.

```
==================== Test output for //src/lib:test_cmd_exec:
Unrecognized option '[run] relative_files=' in config file /usr/local/google/home/mumak/.cache/bazel/_bazel_mumak/0692d959e92750360f91b3f123ed49b8/sandbox/linux-sandbox/243/execroot/salvo/bazel-out/k8-fastbuild/testlogs/_coverage/src/lib/test_cmd_exec/test/.coveragerc
Unknown command: 'lcov'
Use 'coverage help' for help.
--
Coverage runner: Not collecting coverage for failed test.
The following commands failed with status 1
/usr/local/google/home/mumak/.cache/bazel/_bazel_mumak/0692d959e92750360f91b3f123ed49b8/sandbox/linux-sandbox/243/execroot/salvo/bazel-out/k8-fastbuild/bin/src/lib/test_cmd_exec.runfiles/salvo/src/lib/test_cmd_exec
================================================================================
```

Looks like the workaround from [here](https://github.com/bazelbuild/bazel/issues/10660) might no longer work.