Refactor instances of javascript code generated in HAML

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The following discussion from !17831 (merged) should be addressed:

• @mikegreiling started a discussion:

  We really ought to refactor all of these instances of "javascript-in-haml". They rely on global scope, escape our linters, and are difficult to reason about because they can often contain code that is dynamically generated.

  I'll move my concerns to a separate issue, however.