Remove find objects functions

[dhiraj-ms]

Describe your changes
Find objects function is no longer being used in version 4.0.

Type of update
This is an update

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

[codecov]

Codecov Report

Merging #1341 (53b8477) into release-4.0 (940eefc) will not change coverage.
The diff coverage is n/a.

@@              Coverage Diff              @@
##           release-4.0     #1341   +/-   ##
=============================================
  Coverage       100.00%   100.00%           
=============================================
  Files              156       155    -1     
  Lines             6857      6839   -18     
=============================================
- Hits              6857      6839   -18     

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
plantcv/plantcv/__init__.py	100.00% <ø> (ø)

... and 1 file with indirect coverage changes

[nfahlgren]

@all-contributors please add @dhiraj-ms for code, doc, test

[allcontributors]

@nfahlgren

I've put up a pull request to add @dhiraj-ms! 🎉