[logged-out-auth-intro] Merge into main, resolve entitlements/pbxproj conflicts

Union of both branches' entitlements (aps-environment + location.push
from this branch, App Attest CDhash opt-in from PR #41). Signing
settings resolved to Manual/Apple Distribution/AppStore profile -
this branch independently introduced the same Automatic/Apple
Development regression as PR #41 (see e93ccd2); one line
(PROVISIONING_PROFILE_SPECIFIER) merged silently to the broken value
without a marked conflict, caught by manual review and corrected
alongside the marked conflicts.

Darwin/Entitlements.plist

@@ -2,11 +2,15 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>aps-environment</key>
+	<string>development</string>
 	<key>com.apple.developer.devicecheck.app-attest-opt-in</key>
 	<array>
 		<string>CDhash</string>
 	</array>
 	<key>com.apple.developer.devicecheck.appattest-environment</key>
 	<string>$(APP_ATTEST_ENVIRONMENT)</string>
+	<key>com.apple.developer.location.push</key>
+	<true/>
 </dict>
 </plist>