Mixed Structure Data Loss Bug Resolution

[rsh52]

Description

This PR addresses a bug found where mixed structure databases outputs may result in data loss in instances where a form may be both "repeating separately" and "repeating together".

Side note: Are there any additional things we should add to the pkgdown site?

Proposed Changes

List changes below in bullet format:

• Update convert_mixed_structure() field under clean_redcap_long() to account for missing case
• Update associated mixed structure test to account for case
• Update the Mixed Structure test REDCap with a repeating-together event
• Update NEWS.md to be more accurate to present repo

Screenshots
If applicable, add screenshots to help explain the proposed changes

Issue Addressed

Closes #200

PR Checklist

Before submitting this PR, please check and verify below that the submission meets the below criteria:

• New/revised functions have associated tests
• [NA] New/revised functions that update downstream outputs have associated static testing files (.RDS) updated under inst/testdata/create_test_data.R
• New/revised functions use appropriate naming conventions
• New/revised functions don't repeat code
• Code changes are less than 250 lines total
• Issues linked to the PR using GitHub's list of keywords
• The appropriate reviewer is assigned to the PR
• The appropriate developers are assigned to the PR
• [NA] Pre-release package version incremented using usethis::use_version()
  • Using the same version for now under an upcoming 1.2.0 release

Code Review

This section to be used by the reviewer and developers during Code Review after PR submission

Code Review Checklist

• I checked that new files follow naming conventions and are in the right place
• I checked that documentation is complete, clear, and without typos
• I added/edited comments to explain "why" not "how"
• I checked that all new variable and function names follow naming conventions
• I checked that new tests have been written for key business logic and/or bugs that this PR fixes
• I checked that new tests address important edge cases

[ezraporter]

Noted a couple issues in the comments but I think the idea is right!

[ezraporter]

Looks good now! Thanks for making those changes