Remove label parameter from pcv.transform.detect_color_card and auto_correct_color in v5.0

[HaleySchuhl]

Describe the bug
Remove unused label parameter from pcv.transform.detect_color_card and auto_correct_color. Since this is a breaking change, add to v5.0 release.

To Reproduce
Old color correction tutorial breaks when used with v4.6

Expected behavior
No unused inputs, so remove from the function and reflect this change in documentation page. Show the new syntax for calling color chip size now that it is a metadata term (per image) and not an observation (per object).

• PlantCV Version [4.6.0]

Additional context
The reason we didn't realize the label parameter is never used is because it's techincally getting used just from us checking whether it is None or not.

if label is None:
        label = params.sample_label

Thanks to @eseigeldanf for bringing this bug to our attention while updating tutorials.

[HaleySchuhl]

@all-contributors please add @eseigeldanf for bug, tutorial, documentation

@all-contributors please add @trogers623 for tutorial, documentation

@all-contributors please add @Sunitalama2 for tutorial, documentation

[allcontributors]

@HaleySchuhl

I've put up a pull request to add @eseigeldanf! 🎉

[HaleySchuhl]

@all-contributors please add @trogers623 for tutorial, documentation

[allcontributors]

@HaleySchuhl

I've put up a pull request to add @trogers623! 🎉

[HaleySchuhl]

@all-contributors please add @Sunitalama2 for tutorial, documentation

[allcontributors]

@HaleySchuhl

I've put up a pull request to add @Sunitalama2! 🎉

[HaleySchuhl]

Doing these one at a time now, thanks to the new contributors 👏

@all-contributors please add @Sunitalama2 for tutorial, documentation

[allcontributors]

@HaleySchuhl

@Sunitalama2 already contributed before to tutorial, doc

[HaleySchuhl]

@all-contributors please add @clhendrikse for tutorial, documentation

[allcontributors]

@HaleySchuhl

I've put up a pull request to add @clhendrikse! 🎉