Yazi: change the default shellWrapperName yy → y

[phucleeuwu]

Description

base on yazi docs: https://yazi-rs.github.io/docs/quick-start/#shell-wrapper:
We suggest using this y shell wrapper that provides the ability to change the current working directory when exiting Yazi.

Checklist

• Change is backwards compatible.

• Code formatted with nix fmt or
  nix-shell -p treefmt nixfmt-rfc-style keep-sorted --run treefmt.

• Code tested through nix-shell --pure tests -A run.all
  or nix build --reference-lock-file flake.lock ./tests#test-all using Flakes.

• Test cases updated/added. See example.

• Commit messages are formatted like

  {component}: {description}
  
  {long description}
  

  See CONTRIBUTING for more information and recent commit messages for examples.

• If this PR adds a new module

  • Added myself as module maintainer. See example.

Maintainer CC

[Weathercold]

Technically a breaking change since users expect the old alias to be still available
I do think we should use the recommended alias, though.

[phucleeuwu]

y is faster than yy right?. There is no programs except yazi use y as an alias

[Weathercold]

yes. But still a breaking change

[teto]

yes, add a news entry via modules/misc/news/create-news-entry.sh.