Project file removal (#569)

* Deleted project file

* Add back SPM Package.resolved + .gitignore

* Generate project file on release builds

* Converge on single CI setup scripts within `ci_scripts/ci_common.sh`

* Fix unit tests

* Use new `ci_common/setup_github_actions_environment` setup script on all workflows

* Move lfs validation check to the pre-commit hooks. Remove validate-lfs github actions workflow

* Fix integration tests workflow

* Tweaks following code review

.gitignore

@@ -1,3 +1,16 @@
+## Ignore project files as we generate them with xcodegen (https://github.com/yonaskolb/XcodeGen)
+
+# Plus ridiculous workaround to unignore the Package.resolved file for SwiftPM.
+# https://stackoverflow.com/a/16318111/730924
+ElementX.xcodeproj/*
+!ElementX.xcodeproj/project.xcworkspace
+ElementX.xcodeproj/project.xcworkspace/*
+!ElementX.xcodeproj/project.xcworkspace/xcshareddata
+ElementX.xcodeproj/project.xcworkspace/xcshareddata/*
+!ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm
+ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/*
+!ElementX.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved
+
 ## User settings
 xcuserdata/
 
@@ -35,9 +48,6 @@ build
 Tools/Scripts/element-android
 /vendor/
 
-## brew
-Brewfile.lock.json
-
 ## macOS Files
 .DS_Store
 ._*