this is 2024. * observers no more.

[davetsay]

Closes #7710

Describe your changes:

Removed the * observer since the mutable domain object doesn't need it

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-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.50%. Comparing base (a69e300) to head (b282265).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7715      +/-   ##
==========================================
+ Coverage   56.38%   56.50%   +0.11%     
==========================================
  Files         673      673              
  Lines       27185    27181       -4     
  Branches     2635     2635              
==========================================
+ Hits        15329    15359      +30     
+ Misses      11526    11492      -34     
  Partials      330      330              

Flag	Coverage Δ
e2e-full	23.56% <ø> (+<0.01%)	⬆️
e2e-stable	60.38% <ø> (+0.44%)	⬆️
unit	49.21% <ø> (-0.02%)	⬇️

Files	Coverage Δ
src/plugins/condition/ConditionManager.js	86.00% <ø> (+12.96%)	⬆️
...ugins/condition/components/ConditionCollection.vue	0.00% <ø> (ø)
src/plugins/condition/components/ConditionItem.vue	0.00% <ø> (ø)
src/plugins/condition/components/ConditionSet.vue	0.00% <ø> (ø)
src/plugins/condition/components/TestData.vue	0.00% <ø> (ø)

... and 6 files with indirect coverage changes

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[ozyx]

Awesome work. I've left some suggestions for improving test locators and labels

[ozyx]

LGTM. Nice work