dev,bazel: check if the cache process is running

[irfansharif]

Describe the problem

We recently rolled out dev cache to set up a locally running instance of bazel-remote. We also check whether the cache is up and running as part of dev doctor. Post reboot however, if running any bazel/dev commands, you'll observer the following warnings:

WARNING: Writing to Remote Cache:
13 errors during bulk transfer
WARNING: Writing to Remote Cache:
22 errors during bulk transfer

Expected behavior

Probably we should do a cheap check for the cache process, to see if it's running, and maybe kicking it if it isn't. At the very least suggest a manual dev {setup,cache,doctor}.

Epic CRDB-8036

Jira issue: CRDB-13170