feat(multi combobox): `hasPersistentMenu` prop to keep items visible after selection

[silvalaura]

Issue: #947

What I did

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Checklist

• [ ] changeset has been added
• [ ] I have made corresponding changes to the documentation
• [ ] New and existing unit tests pass locally with my changes
• [ ] I have added tests that prove my fix is effective or that my feature works

How to test

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 6a0b6992b4f7666b9df643dda022698474ff835c

The changes in this PR will be included in the next version bump.

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[codecov-commenter]

Codecov Report

Base: 86.29% // Head: 86.26% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (9aaf87d) compared to base (85853ea). Patch coverage: 80.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #946      +/-   ##
==========================================
- Coverage   86.29%   86.26%   -0.04%     
==========================================
  Files         176      176              
  Lines        4728     4731       +3     
  Branches     1629     1631       +2     
==========================================
+ Hits         4080     4081       +1     
- Misses        329      330       +1     
- Partials      319      320       +1     

Impacted Files	Coverage Δ
.../react-magma-dom/src/components/Combobox/index.tsx	100.00% <ø> (ø)
...eact-magma-dom/src/components/Select/ItemsList.tsx	95.00% <ø> (ø)
...agma-dom/src/components/Combobox/MultiCombobox.tsx	89.41% <75.00%> (-2.06%)	:arrow_down:
...agma-dom/src/components/Combobox/ComboboxInput.tsx	72.50% <100.00%> (ø)

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