bazel: dev build after dev generate re-builds many targets

[knz]

This may overlap with #76851 but I was invited by @rickystewart to file a "more specialized" issue.

Symptoms:

• running dev generate then dev build short on a fresh copy of the repo.
• we see during the dev build run that many go packages that were already built by dev generate get re-built again.

It's a bit sad because we're supposed to have a cache so that build artifacts get reused.

Jira issue: CRDB-16486

Epic CRDB-17171

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