fix: report all TODOs in a multi-line comment

[ianlewis]

Description:

Updates the TODO parser to report all TODOs in a multi-line comment.

Related Issues:

Fixes #709

Checklist:

• Review the CONTRIBUTING.md documentation.
• Add a reference to a related issue in the repository.
• Add a description of the changes proposed in the pull request.
• Add unit tests if applicable.
• Add a note in the CHANGELOG.md if applicable.
• Sign the Google CLA.

[codecov]

Codecov Report

Merging #721 (37296d3) into main (0832830) will increase coverage by 0.17%.
The diff coverage is 97.43%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #721      +/-   ##
==========================================
+ Coverage   80.33%   80.50%   +0.17%     
==========================================
  Files          19       19              
  Lines        1129     1144      +15     
  Branches       14       14              
==========================================
+ Hits          907      921      +14     
- Misses        159      160       +1     
  Partials       63       63              

Files Changed	Coverage Δ
internal/todos/todos.go	99.16% <97.43%> (-0.84%)	⬇️