Pr3/3 manage apt key removal

[maisim]

This pull request refactors and modernizes the APT repository and key management logic in src/pyinfra/facts/apt.py and related files. supporting both legacy and deb822 repository formats, and updating keyring handling to use modern GPG infrastructure.

Follow https://github.com/pyinfra-dev/pyinfra/pull/1465

• [ ] Pull request is based on the default branch (3.x at this time)
• [ ] Pull request includes tests for any new/updated operations/facts
• [ ] Pull request includes documentation for any new/updated operations/facts
• [ ] Tests pass (see scripts/dev-test.sh)
• [ ] Type checking & code style passes (see scripts/dev-lint.sh)

[maisim]

WIP, I messed up the rebase of this branch... I'll continue at the end of the week.