Remove `ObservableSet.linkedHashSetFrom()` and use `Set` by default

[pr-1]

Fixes #868.

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Pull Request Checklist

• [x] If the changes are being made to code, ensure the version in pubspec.yaml is updated.
• [x] Increment the major/minor/patch/patch-count, depending on the complexity of change
• [x] Add the necessary unit tests to ensure the coverage does not drop
• [x] Update the Changelog to include all changes made in this PR
• [x] Run the set:versions command using npm or yarn. You can find this command in the package.json file in the root directory
• [x] Include the necessary reviewers for the PR

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[codecov[bot]]

Codecov Report

Merging #869 (025148a) into master (9b7a00d) will increase coverage by 0.10%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #869      +/-   ##
==========================================
+ Coverage   98.80%   98.90%   +0.10%     
==========================================
  Files          55       55              
  Lines        1925     1920       -5     
==========================================
- Hits         1902     1899       -3     
+ Misses         23       21       -2     

Flag	Coverage Δ
flutter_mobx	100.00% <ø> (ø)
mobx	98.45% <100.00%> (+0.14%)	:arrow_up:
mobx_codegen	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...src/api/observable_collections/observable_set.dart	100.00% <100.00%> (+2.35%)	:arrow_up:

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[pr-1]

@fzyzcjy @pavanpodila Please have a look

[fzyzcjy]

Approve after the final change

[pavanpodila]

resolve conflicts pls before merge @pr-1

[pr-1]

Updated version to 2.0.8 @pavanpodila Please let me know if that is correct or this change should go in patch-count . Resolved conflicts.

[pavanpodila]

Also there are some hygiene changes being pushed into main. Please take a pull from that as well (possibly in 30 mins). @pr-1