Remove _Pods.xcodeproj to allow swift package-registry publish command to succeed

[albertodebortoli]

Brief Summary of Changes

What does this PR address?

• GitHub issue (Add reference - The presence of the _Pods.xcodeproj symlink prevents uploading to a Swift Registry #445)
• Refactoring
• New feature
• Bug fix
• Adds more tests

Are tests included?

• Yes
• No // No new tests are needed for this change

Reviewer, please note:

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I ran the full test suite before pushing the changes and all the tests pass. -> This should be guaranteed by the CI pipelines on this repo anyway.

[albertodebortoli]

Hello! Gentle ping.

[tommyg-cld]

@albertodebortoli it's in our backlog but no ETA. We will keep you posted.