Update namespaces.json as part of the release build

[bbockelm]

We should ensure that the namespaces.json is always updated as part of the release process. Three ideas:

1. Invoke the new update script in Update the bundled namespaces.json and add a script for it #71 as part of the release GHA, embedding the new namespace into the binary itself (but not in the code base).
2. Same as (1) but have the release workflow also commit back to the original branch.
3. Only invoke the update script on tags matching $FOO-staging. Then the GHA updates the namespaces.json, commits it to the same branch, tags it $FOO, and pushes the release tag.