[ews-build.webkit.org] Land from branch aliases (Follow-up)

[JonWBedard]

3da32ba

[ews-build.webkit.org] Land from branch aliases (Follow-up)
https://bugs.webkit.org/show_bug.cgi?id=247979
rdar://102419945

Reviewed by Aakash Jain.

* Tools/CISupport/ews-build/factories.py:
(MergeQueueFactoryBase.__init__): Map branch alias before checking out branches, but after fetching.
* Tools/CISupport/ews-build/factories_unittest.py:
(TestExpectedBuildSteps):

Canonical link: https://commits.webkit.org/256797@main

c33f002

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash c33f002)

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

[JonWBedard]

This is looking to fix the problem I saw in this run:
https://ews-build.webkit.org/#/builders/75/builds/2266

Basically, we need to check out the ref of the branch we're using.

[webkit-commit-queue]

Committed 256797@main (3da32ba): https://commits.webkit.org/256797@main

Reviewed commits have been landed. Closing PR #6591 and removing active labels.