Add suggested Bazel flags

- `--experimental_remote_cache_compression` to improve remote cache throughput
- `--nolegacy_important_outputs` to reduce the payload size of the uploaded build event stream by eliminating duplicate file references

Author: avdv

.bazelrc.common

@@ -51,6 +51,9 @@ build:ci --bes_backend=grpcs://remote.buildbuddy.io
 
 common:ci-common --color=no
 
+common:ci-common --nolegacy_important_outputs
+build:ci-common --experimental_remote_cache_compression
+
 build:ci-common --loading_phase_threads=1
 build:ci-common --verbose_failures
 # Make sure we don't rely on the names of convenience symlinks because those