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/IDETemplateMacros.plist

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-    <key>FILEHEADER</key>
-    <string>
-// Copyright ___YEAR___ New Vector Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//</string>
-</dict>
-</plist>