Process results in series

[joshqsumner]

Describe your changes
Moved plantcv.parallel.process_results and plantcv.parallel.json2csv to the main plantcv.plantcv module.

Type of update
This is a feature enhancement/restructuring to allow for clearer use of outputs from jupyter notebooks/non-parallel workflows.

Associated issues
None (whoops), discussed talked about in dev meeting 10/3/2025 and a few times in passing since then.

Additional context
Follows after removing the utils subpackage.

For the reviewer
See this page for instructions on how to review the pull request.

• PR functionality reviewed in a Jupyter Notebook
• All tests pass
• Test coverage remains 100%
• Documentation tested
• New documentation pages added to plantcv/mkdocs.yml
• Changes to function input/output signatures added to updating.md
• Code reviewed
• PR approved

[deepsource-io]

DeepSource Code Review

DeepSource reviewed changes in the commit range 49b3f70...b88334a on this pull request. Below is the summary for the review, and you can see the individual issues we found as review comments.

For detailed review results, please see the PR on DeepSource ↗

PR Report Card

Security	× 0 issues		Overall PR Quality
Reliability	× 0 issues
Complexity	× 0 issues
Hygiene	× 0 issues
Coverage	× 0 issues

Code Review Summary

Analyzer	Status	Summary	Details
Python		No new issues detected.	Review ↗
Test coverage		No new issues detected.	Review ↗

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Code Coverage Summary

Language	Line Coverage		Branch Coverage
	New Code	Overall	New Code	Overall
Aggregate	100% [✓ above threshold]	100%	100%	100%
Python	100% [✓ above threshold]	100%	100%	100%

➟ Additional coverage metrics may have been reported. See full coverage report ↗