Auto merge of #19041 - jmaher:mozbuild, r=jdm

Bug 1411583 - servo directory in-tree has no BUGZILLA_COMPONENTS info…

…rmation

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this is a new file which doesn't affect anything in servo, instead this is used for when servo is vendored into mozilla-central to build Firefox we expect all files in the tree to have a mapping to a bugzilla component.

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<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
    - NOTE: I pushed to try to get this, running locally was taking a long time
- [X] `./mach test-tidy` does not report any errors
- [X] These changes fix https://bugzilla.mozilla.org/show_bug.cgi?id=1411583

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- [X] These changes do not require tests because this is a meta data file for when this code is added to mozilla-central

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