We had the same setup, ex-Googler SRE demanded builds be done with Bazel for our Go monorepo. He convinced someone to switch it all over, all builds, deploys, CI, testing, etc were all dependent on Bazel.
That person left, and the Bazel stuff was left unmaintained as no one had the interest nor time to learn it.
Later Bazel decide to kill off rules_docker and replace it with rules_oci, which means we can no longer update our Golang version without a super painful migration where we end up breaking production a bunch of times because of quirks in the super difficult migration.
Eventually we invested the time to rip the whole thing out and replace it with standard Go tooling with a multistage docker build for the container image. Everything from running tests, using Golang tooling, legibility of builds, CI, and deploys is easier.
The best thing we did was remove it and move to standard Golang tooling.