herbstluftwm: Make herbstclient alias optional

[olmokramer]

Description

The herbstclient alias made it impossible to use bash functions in the autostart script for herbstluftwm, as described in #5213.

This makes the herbstclient alias optional by adding an extra herbstclientAlias option on the herbstluftwm configuration. The new option defaults to false as to not confuse newcomers to the herbstluftwm module, which is not a breaking change because it was only an optimization.

Fixes #5213

Checklist

• [x] Change is backwards compatible.

• [x] Code formatted with ./format.

• [x] Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

• [x] Test cases updated/added. See example.

• [x] 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

[olmokramer]

The test failures on macos don't seem to be related to this PR, these changes should only affect Linux.

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[olmokramer]

Still relevant.

[stale[bot]]

Thank you for your contribution! I marked this pull request as stale due to inactivity. Please read the relevant sections below before commenting.

If you are the original author of the PR

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• If it is unfinished but you plan to finish it, please mark it as a draft.
• If you don't expect to work on it any time soon, please consider closing it with a short comment encouraging someone else to pick up your work.
• To get things rolling again, rebase the PR against the target branch and address valid comments.

If you are not the original author of the PR

• If you want to pick up the work on this PR, please create a new PR and indicate that it supercedes and closes this PR.