[macOS] WebProcess names in Activity Monitor cannot include non-Latin1 characters

[cdumez]

c452365

[macOS] WebProcess names in Activity Monitor cannot include non-Latin1 characters
https://bugs.webkit.org/show_bug.cgi?id=257179
rdar://109691473

Reviewed by Alex Christensen.

We are sending the application name as UTF-8 over XPC like so:
```
xpc_dictionary_set_string(bootstrapMessage.get(), "ui-process-name", [[[NSProcessInfo processInfo] processName] UTF8String]);
```

But we were decoding it as Latin1 instead of UTF-8 on the recipient side. This
was the cause of the bug.

* Source/WebKit/Shared/EntryPointUtilities/Cocoa/XPCService/XPCServiceEntryPoint.mm:
(WebKit::XPCServiceInitializerDelegate::getClientProcessName):

Canonical link: https://commits.webkit.org/264403@main

d7071ab

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash d7071ab)

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

[webkit-commit-queue]

Committed 264403@main (c452365): https://commits.webkit.org/264403@main

Reviewed commits have been landed. Closing PR #14226 and removing active labels.