Add WritableStreamDefaultController signal getter

[youennf]

5815663

Add WritableStreamDefaultController signal getter
https://bugs.webkit.org/show_bug.cgi?id=248600
rdar://problem/102858374

Reviewed by Alex Christensen.

Add signal as attribute and signal it as aborted when stream gets aborted.
Add necessary built-in globals to interact with AbortSignal.
Covered by rebased tests.

* LayoutTests/imported/w3c/web-platform-tests/streams/idlharness.any-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/streams/idlharness.any.serviceworker-expected.txt:
* LayoutTests/imported/w3c/web-platform-tests/streams/idlharness.any.worker-expected.txt:
* Source/WebCore/Modules/streams/WritableStreamDefaultController.idl:
* Source/WebCore/Modules/streams/WritableStreamDefaultController.js:
(getter.signal):
* Source/WebCore/Modules/streams/WritableStreamInternals.js:
(writableStreamAbort):
(setUpWritableStreamDefaultController):
* Source/WebCore/bindings/js/JSDOMGlobalObject.cpp:
(WebCore::JSC_DEFINE_HOST_FUNCTION):
(WebCore::JSDOMGlobalObject::addBuiltinGlobals):
* Source/WebCore/bindings/js/WebCoreBuiltinNames.h:

Canonical link: https://commits.webkit.org/257397@main

692cb1c

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	❌ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	❌ 🧪 mac-AS-debug-wk2
✅ 🛠 🧪 merge	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 7414e93)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	❌ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 692cb1c)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	❌ 🛠 🧪 win
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🛠 gtk	✅ 🛠 wincairo
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-wk2
	✅ 🛠 tv-sim	❌ 🧪 mac-AS-debug-wk2
✅ 🛠 🧪 merge	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 257397@main (5815663): https://commits.webkit.org/257397@main

Reviewed commits have been landed. Closing PR #7022 and removing active labels.