build: avoid bazel analysis cache discarding (#17461)

It looks like Bazel sometimes discards the analysis cache
when switching between testing/running and plain building.

This is because b3a0037 introduced a flag
for disabling legacy bazel behavior. This flag has been only
applied to "run" and "test", but not for "build". This means
that we accidentally switch the environment, and Bazel discards
the analysis cache (slowing down the development).

Author: devversion

.bazelrc

@@ -13,6 +13,7 @@ build --symlink_prefix=/
 build --watchfs
 
 # Turn off legacy external runfiles
+build --nolegacy_external_runfiles
 run --nolegacy_external_runfiles
 test --nolegacy_external_runfiles