This diff was generated as follows:
List all toml files in the tree:
`find * -name '*.toml' > /tmp/toml`
Manually edited /tmp/toml to drop non-relevant entries (objdir).
Ran the toml linter for all files:
`cat /tmp/toml | xargs ./mach lint -l test-manifest-toml --fix`
Differential Revision: https://phabricator.services.mozilla.com/D240948
