refactor(angular): remove Config.set

[liamdebeasi]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe): breaking change

What is the current behavior?

Issue Number: #19104

What is the new behavior?

The Config.set() method has been removed. See https://ionicframework.com/docs/angular/config for examples on how to set config globally, per-component, and per-platform.

Does this introduce a breaking change?

• Yes
• No

Other information