Remove Pajamas Dangerfile

What does this MR do and why?

Removes the Pajamas Dangerfile.

The checks here are superseded by the Pajamas Adoption Scanner, implemented in !141368 (merged) and !142704 (merged).

Part of #367738 (closed).

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

n/a

How to set up and validate locally

Note that Pajamas warnings/errors will no longer show up in the Danger comment (i.e., the Deprecated components section: 1, 2).

Related to #367738 (closed)