Remove the swiftlint plugin

[pinarol]

Closes #

Description

This is to fix the CI error happening in the WPiOS PR.

https://buildkite.com/automattic/wordpress-ios/builds/24291#0192c309-9143-44d1-9694-e370477ac26d

error: "SwiftLintBuildToolPlugin" must be enabled before it can be used

This is a quick solution to unblock the release. We can bring it back once we find a way to disable it when the Gravatar SDK is integrated into a client app.

Testing Steps

[wpmobilebot]

📲 You can test the changes from this Pull Request in Gravatar SwiftUI Prototype Build by scanning the QR code below to install the corresponding build.

	App Name	Gravatar SwiftUI Prototype Build
	Build Number	1627
	Version	1.0
	Bundle ID	com.automattic.gravatar-sdk-demo-swiftui.prototype-build
	Commit	0a11c9b4b1e386080f160e069716b35f45782d27
	App Center Build	Gravatar SDK Demo - SwiftUI #329

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.

[wpmobilebot]

📲 You can test the changes from this Pull Request in Gravatar UIKit Prototype Build by scanning the QR code below to install the corresponding build.

	App Name	Gravatar UIKit Prototype Build
	Build Number	1627
	Version	1.0
	Bundle ID	com.automattic.gravatar-sdk-demo-uikit.prototype-build
	Commit	0a11c9b4b1e386080f160e069716b35f45782d27
	App Center Build	Gravatar SDK Demo - UIKit #330

Automatticians: You can use our internal self-serve MC tool to give yourself access to App Center if needed.