Import perf improvement

[akhenry]

Closes https://github.com/nasa/openmct/issues/7612

Describe your changes:

All Submissions:

• [ ] Have you followed the guidelines in our Contributing document?
• [ ] Have you checked to ensure there aren't other open Pull Requests for the same update/change?
• [ ] 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?

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?

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 0% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 59.95%. Comparing base (4027eae) to head (5f999c0).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7604      +/-   ##
==========================================
+ Coverage   56.46%   59.95%   +3.48%     
==========================================
  Files         672      430     -242     
  Lines       27112    13472   -13640     
  Branches     2635        0    -2635     
==========================================
- Hits        15310     8077    -7233     
+ Misses      11477     5395    -6082     
+ Partials      325        0     -325     

Flag	Coverage Δ
e2e-full	23.57% <0.00%> (-18.15%)	:arrow_down:
e2e-stable	59.86% <0.00%> (-0.08%)	:arrow_down:
unit	?

Files	Coverage Δ
...ugins/importFromJSONAction/ImportFromJSONAction.js	14.54% <0.00%> (-50.72%)	:arrow_down:

... and 376 files with indirect coverage changes

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