Exclude `pyqt` from installers

[jaimergp]

Pending new version of constructor, which provides solver-less installs thanks to conda/constructor#559

[jaimergp]

Even if we will remove pyqt from the installation, a plugin might still bring it back if it directly depends on it, or a dependency does. We have setup a CI pipeline to analyse potential cases like this, and we are finding a few.

I'll be collecting them here, along with the relevant issues and PRs fixing it.

• palmari
  • Explicit dependency on PyQt5 hippover/palmari#1
  • Remove pyqt conda-forge/palmari-feedstock#1
• napari-time-reader
  • pyqt5 dependency haesleinhuepf/napari-time-slicer#8
  • Remove pyqt conda-forge/napari-time-slicer-feedstock#9
  • Affects beetlesafari, napari-accelerated-pixel-and-object-classification, napari-assistant, napari-pyclesperanto-assistant, napari-segment-blobs-and-things-with-membranes, napari-workflow-optimizer, guanine-crystal-analysis, napari-cupy-image-processing, napari-simpleitk-image-processing
• iacs-ipac-reader
  • Explicit dependency on PyQt5 zcqwh/iacs_ipac_reader#1
  • Use qtpy instead of PyQt directly zcqwh/iacs_ipac_reader#2
• napari-live-recording
  • Update to 0.2.1 conda-forge/napari-live-recording-feedstock#2
• platymatch
  • Fix: Make sure to not depend on PyQt juglab/PlatyMatch#7
• napari-allencell-segmenter
  • Explicit dependency on PyQt5 instead of qtpy AllenCell/napari-allencell-segmenter#149
• napari-nD-annotator
  • Package is using PyQt5 imports instead of qtpy bauerdavid/napari-nD-annotator#39

[psobolewskiPhD]

@jaimergp another thing to check for might be depending on napari[all] since this also pulls in PyQt.
See for example PlatyMatch: juglab/PlatyMatch#7

[jaimergp]

Thanks @psobolewskiPhD! I checked the conda-forge recipe and it doesn't suffer from that issue, since there's no napari[all] option in conda, just napari, so we are covered in this case!

[psobolewskiPhD]

Oh good.
Alas that specific one does have a from PyQt5.QtCore import Qt as well.
Hopefully the devs take a look at my PR.

[jaimergp]

Oh I had missed the PR content! Good catch! So far the experimental CI doesn't check the source content. I think we could talk with the napari-hub team to set some kind of static code analysis though.