Remove ignored iOS schemes from template (#26471)

Summary:
The merge of #25451 added `xcshareddata` to the .gitignore file in `template`. Two xcscheme files in the `xcschemes` subfolder were still left in the template and should have been removed at the same time.

The project opens and builds fine without the xcscheme files both from command line and in Xcode.

## Changelog

[iOS] [Changed] - Remove ignored iOS schemes from template
Pull Request resolved: #26471

Test Plan:
Generate new project, remove files, verify that project builds, and opens correctly in Xcode.

Please review karanjthakkar satya164 kelset

Differential Revision: D17491748

Pulled By: cpojer

fbshipit-source-id: 391545293c2d09d52f78f56cd91cef5dcf036a9a

Author: friederbluemle