[action] allow using a .xcode-version file with xcversion action

[rogerluan]

Checklist

• I've run bundle exec rspec from the root directory to see all new and existing tests pass
• I've followed the fastlane code style and run bundle exec rubocop -a to ensure the code style is valid
• I've read the Contribution Guidelines
• I've updated the documentation if necessary.

Motivation and Context

I felt the necessity to unify the implementation to a single .xcode-version file, making it consistent with xcode-install itself, and ensure_xcode_version action.

Description

This PR allows us to use a .xcode-version and omit the :version parameter when invoking xcversion action. It finds and reads the contents of a .xcode-version file just like the ensure_xcode_version action does:

fastlane/fastlane/lib/fastlane/actions/ensure_xcode_version.rb

Lines 9 to 23 in dac3164

	if required_version.to_s.length == 0
	# The user didn't provide an Xcode version, let's see
	# if the current project has a `.xcode-version` file
	#
	# The code below can be improved to also consider
	# the directory of the Xcode project
	xcode_version_paths = Dir.glob(".xcode-version")
	if xcode_version_paths.first
	UI.verbose("Loading required version from #{xcode_version_paths.first}")
	required_version = File.read(xcode_version_paths.first).strip
	else
	UI.user_error!("No version: provided when calling the `ensure_xcode_version` action")
	end
	end

Testing Steps

To test this branch, modify your Gemfile as:

gem "fastlane", :git => "https://github.com/fastlane/fastlane.git", :branch => "rogerluan-use-xcode-version-file-with-xcversion"

And run bundle install to apply the changes.

[joshdholtz]

@rogerluan Added my changes if you don't mind reviewing this whenever you get a chance 😇

[rogerluan]

LGTM @joshdholtz ! 🚀 thanks for those improvements! Much better!
(and now I've learned how to implement a dynamic default value 😁 )

[joshdholtz]

Thank so much for doing all the heavy lifting on this PR 😊 This is a great change 🙌

[fastlane-bot]

Hey @rogerluan 👋

Thank you for your contribution to fastlane and congrats on getting this pull request merged 🎉
The code change now lives in the master branch, however it wasn't released to RubyGems yet.
We usually ship about once a week, and your PR will be included in the next one.

Please let us know if this change requires an immediate release by adding a comment here 👍
We'll notify you once we shipped a new release with your changes 🚀

[fastlane-bot]

Congratulations! 🎉 This was released as part of fastlane 2.199.0 🚀