Moved WorkerId type to devtools_traits

[fstr]

Fixes #8846.

[highfive]

Thanks for the pull request, and welcome! The Servo team is excited to review your changes, and you should hear from @larsbergstrom (or someone else) soon.

[Ms2ger]

Thanks for the PR! Unfortunately our "tidy" check caught one small mistake; see below. Let me know when you've made the change?

-S-awaiting-review +S-needs-code-changes

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Reviewed 9 of 9 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion, some commit checks failed.

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components/script/dom/window.rs, line 7 [r1] (raw file):
Could you merge those two use blocks? Right now, this fails our "tidy" check? Please confirm that ./mach test-tidy reports no errors after fixing that.

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Comments from the review on Reviewable.io

[fstr]

components/script/dom/window.rs, line 7 [r1] (raw file):
I tried to find out a pattern for the use statements. Sometimes there's a second use statement for more than 3 imports.

Sometimes, they are all chained in one line.

Interestingly, what works for the tidy check is

use devtools_traits::{ScriptToDevtoolsControlMsg, TimelineMarker, TimelineMarkerType};
use devtools_traits::{WorkerId};

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*Comments from the [review on Reviewable.io](https://reviewable.io:443/reviews/servo/servo/8862)*
<!-- Sent from Reviewable.io -->

[Ms2ger]

Thank you. Can you please squash the two commits now?

-S-awaiting-review +S-needs-squash

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Reviewed 1 of 1 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from the review on Reviewable.io

[fstr]

Done!

[Ms2ger]

Thanks again, your help is much appreciated.

@bors-servo r+

[bors-servo]

📌 Commit b81f712 has been approved by Ms2ger

[bors-servo]

⌛ Testing commit b81f712 with merge 02f4be9...

[bors-servo]

☀️ Test successful - android, gonk, linux-dev, linux-rel, mac-dev-ref-unit, mac-rel-css, mac-rel-wpt