Summary:
Fixes issues with go license generation.
Brings back js license generation.

TODO: Still need to handle go packages that are from https://pkg.go.dev/
and not https://github.com

TODO: CPP license generation should probably include a SPDX ID for the
license instead of just the raw license text.

Test Plan: Run the tools to collect js, go, cpp licenses.

Reviewers: zasgar, michelle, philkuz, #engineering

Reviewed By: philkuz, #engineering

Differential Revision: https://phab.corp.pixielabs.ai/D6642

GitOrigin-RevId: 5b59eb01c198b4d835d4034fbed8c0bff1028fa3