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

ElementX.xcodeproj/xcshareddata/xcschemes/UnitTests.xcscheme

@@ -1,120 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Scheme
-   LastUpgradeVersion = "1200"
-   version = "1.7">
-   <BuildAction
-      parallelizeBuildables = "YES"
-      buildImplicitDependencies = "YES"
-      runPostActionsOnFailure = "NO">
-      <BuildActionEntries>
-         <BuildActionEntry
-            buildForTesting = "YES"
-            buildForRunning = "YES"
-            buildForProfiling = "YES"
-            buildForArchiving = "YES"
-            buildForAnalyzing = "YES">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "32C23C8D224D46EFE62AFAD0"
-               BuildableName = "UnitTests.xctest"
-               BlueprintName = "UnitTests"
-               ReferencedContainer = "container:ElementX.xcodeproj">
-            </BuildableReference>
-         </BuildActionEntry>
-      </BuildActionEntries>
-   </BuildAction>
-   <TestAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      codeCoverageEnabled = "YES"
-      onlyGenerateCoverageForSpecifiedTargets = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "32C23C8D224D46EFE62AFAD0"
-            BuildableName = "UnitTests.xctest"
-            BlueprintName = "UnitTests"
-            ReferencedContainer = "container:ElementX.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <Testables>
-         <TestableReference
-            skipped = "NO">
-            <BuildableReference
-               BuildableIdentifier = "primary"
-               BlueprintIdentifier = "32C23C8D224D46EFE62AFAD0"
-               BuildableName = "UnitTests.xctest"
-               BlueprintName = "UnitTests"
-               ReferencedContainer = "container:ElementX.xcodeproj">
-            </BuildableReference>
-         </TestableReference>
-      </Testables>
-      <CommandLineArguments>
-      </CommandLineArguments>
-      <CodeCoverageTargets>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "C0FAEB81CFD9776CD78CE489"
-            BuildableName = "ElementX.app"
-            BlueprintName = "ElementX"
-            ReferencedContainer = "container:ElementX.xcodeproj">
-         </BuildableReference>
-      </CodeCoverageTargets>
-   </TestAction>
-   <LaunchAction
-      buildConfiguration = "Debug"
-      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
-      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      launchStyle = "0"
-      useCustomWorkingDirectory = "NO"
-      ignoresPersistentStateOnLaunch = "NO"
-      debugDocumentVersioning = "YES"
-      debugServiceExtension = "internal"
-      allowLocationSimulation = "YES">
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "32C23C8D224D46EFE62AFAD0"
-            BuildableName = "UnitTests.xctest"
-            BlueprintName = "UnitTests"
-            ReferencedContainer = "container:ElementX.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-      <CommandLineArguments>
-      </CommandLineArguments>
-      <EnvironmentVariables>
-         <EnvironmentVariable
-            key = "IS_RUNNING_UNIT_TESTS"
-            value = "1"
-            isEnabled = "YES">
-         </EnvironmentVariable>
-      </EnvironmentVariables>
-   </LaunchAction>
-   <ProfileAction
-      buildConfiguration = "Release"
-      shouldUseLaunchSchemeArgsEnv = "YES"
-      savedToolIdentifier = ""
-      useCustomWorkingDirectory = "NO"
-      debugDocumentVersioning = "YES">
-      <CommandLineArguments>
-      </CommandLineArguments>
-      <MacroExpansion>
-         <BuildableReference
-            BuildableIdentifier = "primary"
-            BlueprintIdentifier = "32C23C8D224D46EFE62AFAD0"
-            BuildableName = "UnitTests.xctest"
-            BlueprintName = "UnitTests"
-            ReferencedContainer = "container:ElementX.xcodeproj">
-         </BuildableReference>
-      </MacroExpansion>
-   </ProfileAction>
-   <AnalyzeAction
-      buildConfiguration = "Debug">
-   </AnalyzeAction>
-   <ArchiveAction
-      buildConfiguration = "Release"
-      revealArchiveInOrganizer = "YES">
-   </ArchiveAction>
-</Scheme>