Remove CocoaPods (#23958)

* Run `pod deintegrate` and remove CocoaPods automation

* Add `Makefile` automation to download Gutenberg framework

* Remove dead reference to `Pods.framework` in project

* Remove dead reference to pods from workspace

* Remove SwiftLint-via-CocoaPods from `Rakefile`

* Remove unnecessary `$(inherited)` flag from a couple of targets

That's for the value `CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER`,
but it's useless to set `$(inherited)` for a Yes or No value because
removing the value from the target will automatically make Xcode read it
from the project, achieving the same result.

* Remove CocoaPods instruction from the README

* Remove SwiftLint instructions from the `README`

* Add a version of Aztec fetched via SwiftPM

* Add Gutenberg XCFrameworks via drag-n-drop from local paths

* Disable `CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER`

Was giving errors in Yoga:

> Double-quoted include "YGEnums.h" in framework header, expected angle-bracketed instead

* Disable `CLANG_WARN_STRICT_PROTOTYPES`

It resulted in a build failure:

> React.framework/Headers/RCTAppearance.h:16:60:
> A function declaration without a prototype is deprecated in all versions of C

* Update search path for Gutenberg React Native bundle in script

* Remove some leftover bits of CocoaPods set up for automation

* Remove leftover `COCOAPODS` precompiler flag

Strange that `pod deintegrate` did not remove it. Maybe it was some
custom piece of setup...

* Remove a couple of CocoaPods-specific code branches

* Temporarily switch to CI toolkit branch compatible with no CocoaPods

* Fetch XCFrameworks in CI

* Update Gutenberg checkout logic in localization lint for CP-less setup

* Update source map upload for CP-less Gutenberg setup

* Ensure `Frameworks` folder exist, otherwise tar will fail

* Remove "Log Outdated Pods" step from code freeze

We don't have pods anymore

* Remove Pods from lists in `.gitignore` and RuboCop

We don't use Pods anymore

* Remove imports of Pods xcconfigs

* No longer look in Pods folder to extract localizations

* Link Gutenberg XCFramework in Jetpack target too!

* Add instruction in README to run `make dependencies`

* Use CI toolkit 3.8.0

* Point Aztec to branch in wordpress-mobile org from SPM support PR

See wordpress-mobile/AztecEditor-iOS#1379

* Point Aztec to latest SwiftPM-support commit

* Point to latest Aztec, 1.20.0

* Reimplement logic to download XCFrameworks from `make` to `rake`

* Remove a debug `set +x`

* Rewrite `gutenberg_xcframeworks` using Ruby APIs

More idiomatic and safer than shelling out. See
#23958 (comment)

* Also delete `tar.gz` when cleaning up after setting up Gutenberg

* Ignore `Pods/` for retro-compatibility

Author: mokagio

.buildkite/commands/build-for-testing.sh

@@ -11,11 +11,7 @@ echo "--- :beer: Installing Homebrew Dependencies"
 brew tap FelixHerrmann/tap
 brew install swift-package-list
 
-echo "--- :rubygems: Setting up Gems"
-install_gems
-
-echo "--- :cocoapods: Setting up Pods"
-install_cocoapods
+"$(dirname "${BASH_SOURCE[0]}")/shared-set-up.sh"
 
 echo "--- :writing_hand: Copy Files"
 mkdir -pv ~/.configure/wordpress-ios/secrets
@@ -24,9 +20,6 @@ cp -v fastlane/env/project.env-example ~/.configure/wordpress-ios/secrets/projec
 echo "--- :closed_lock_with_key: Installing Secrets"
 bundle exec fastlane run configure_apply
 
-echo "--- :swift: Setting up Swift Packages"
-install_swiftpm_dependencies
-
 echo "--- :hammer_and_wrench: Building"
 bundle exec fastlane build_${APP}_for_testing