Closes #7899

Describe your changes: I am working on a team and trying to contribute to this project. This first contribution is supposed to be small and get us used to creating a pr. The change basically decouples the selection.js module with the DOM manipulation. This also makes selction.js adhere to SRP. We understand this is not a significant change but that is exactly what we we were looking for because of the description of our assignment.

All Submissions:

• Have you followed the guidelines in our [Contributing document] Yes (I think so)(https://github.com/nasa/openmct/blob/master/CONTRIBUTING.md)?
• Have you checked to ensure there aren't other open Pull Requests for the same update/change? Yes
• Is this a notable change that will require a special callout in the release notes? For example, will this break compatibility with existing APIs or projects that consume these plugins? No

Author Checklist

• Changes address original issue?
• Tests included and/or updated with changes?
• Has this been smoke tested?
• Have you associated this PR with a type: label? Note: this is not necessarily the same as the original issue.
• Have you associated a milestone with this PR? Note: leave blank if unsure.
• Testing instructions included in associated issue OR is this a dependency/testcase change?

Reviewer Checklist

• Changes appear to address issue?
• Reviewer has tested changes by following the provided instructions?
• Changes appear not to be breaking changes?
• Appropriate automated tests included?
• Code style and in-line documentation are appropriate?