port-mirroring: remove package

port-mirroring: remove package

- The project was archived on Mar 22, 2024.
- The maintainer of the package and the upstream maintainer are the
  same person, who has expressed their intention not to maintain the
  package/project. See the quote[1] below:

  > I haven't been maintaining this and I don't plan to spend any more
  > time on it. Happy to hand it off, if someone is willing to take it on.

- The latest significant commit for the package (no treewide changes)
  is commit 2c71d5bcd4e09b926d63d0fbba39534fd2c587f7 from Mar 29, 2020.
- The latest upstream commit[2] is from Mar 22, 2024, but it is a
  documentation or cosmetic change. After this, the latest commits[3]
  are from Apr 6, 2019.

[1]: https://github.com/openwrt/packages/pull/27398#issuecomment-3250671659
[2]: https://github.com/mmaraya/port-mirroring/commit/776fe2bb48333a0414fde609b1c63b11d298246b
[3]: https://github.com/mmaraya/port-mirroring/commit/dcce6aeb0a977090ebd4a3c80a33df7715241f21

Closes: https://github.com/openwrt/packages/issues/27394
Signed-off-by: Wesley Gimenes <[email protected]>