Add SonarJS plugin for ESLint

[helms-charity]

After installing the SonarQube plugin for Cursor/VSCode, I realized there was an NPM package just for SonarJS and an ESLint plugin.
https://github.com/SonarSource/SonarJS/blob/master/packages/jsts/src/rules/README.md

Adding the plugin as a project devDependency so lint works for everyone (including CI).

I also see our ESLint is outdated, but not sure if updating will break things (such as the Github build action). I also will do more of a comparison between the SonarQube IDE extension vs. the ESLint plugin and see what is best for our needs.