Auto merge of #11943 - aneeshusa:add-nightly-upload-script, r=larsbergstrom

Add a script to upload nightly packages to S3

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The nightly package name includes the date, and so we use a glob to
locate the package file without hard coding a value. However, globbing
will not work with our Buildbot steps setup because we perform word
splitting ourselves and pass an array to Buildbot, which will directly
exec the array instead of passing it to the shell, meaning globbing
does not occur. Instead, add a script to the servo repo where we can
use globbing, and use `shopt -s failglob` to guard against bad globs.

cc @larsbergstrom @edunham

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [ ] These changes are needed for #9921  (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because will be tested by buildbot

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