Fix checked-in but ignored files

[mhofman]

What is the Problem Being Solved?

$ git ls-files --cached -i --exclude-standard
multichain-testing/tools/bundle-tools.js
packages/SwingSet/src/controller/bundle-handler.js
packages/SwingSet/test/bundle-handler.test.js

Description of the Design

Rename or exempt these files from ignore. Add a CI test to avoid introducing new checked-in files covered by an ignore directive.

Security Considerations

None

Scaling Considerations

None

Test Plan

CI test

Upgrade Considerations

None