[feat] Check and fix duplicated figure/table chunk labels

[sbreitbart-NOAA]

What is the feature?

• Create function that checks for duplicated chunk labels in fig/table docs, and if present, comments out duplicates (as per [feat]: add check in create_figures/tables_doc to ensure chunk labels are unique #451)
• Update tests

How have you implemented the solution?

• Creating fix_duplicate_chunks() function in utils

Does the PR impact any other area of the project, maybe another repo?

• No

[github-actions]

Checklist

• PR base branch is accurate
• Is the code concise?
• Comments are clear and useful.
• Can you remove or combine any arguments?
• Do argument contain defaults (if appliable)?
• Code is documented and example provided (Roxygen).
• Did you make a test (testthat)?
• Was this tested under multiple scenarios?
• Did you run devtools::check()?

[github-actions]

New version checklist

• Package version in DESCRIPTION has been updated
• Release notes have been drafted/published
• Cheatsheet content has been updated (if applicable)
• Cheatsheet version has been updated

[github-actions]

Code Metrics Report

Coverage	Code to Test Ratio	Test Execution Time
37.4%	1:0.2	26s

Code coverage of files in pull request scope (55.2%)

Files	Coverage
R/create_figures_doc.R	84.8%
R/create_tables_doc.R	53.9%
R/utils.R	31.6%

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Reported by octocov

[Schiano-NOAA]

I'm going to tag team on this and make checks for duplicate rda's/images as well and have both issues solved in one. I tested this out and I think this is a good start, but it does a couple of thing

(1) I think the commenting out is a good solution, but I am going to add a check to see if the same image is loaded in. In the case it is, the the chunk will be removed/won't be added. In the case it's not, I think it would be better to rename the label with a 1 or other alternative so it's still accessible to the user

(2) I will adjust the lapply or a loop to go through the chunks and make sure ones that have already been added are not added