feat(testing): add harness for island

[zarghamkhandev]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows Conventional Commits
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Refactoring
• Code style update
• Build or CI related changes
• Documentation content changes

Partially implements #476

Does this PR introduce a breaking change?

• Yes
• No

[codecov]

Codecov Report

Base: 56.67% // Head: 56.67% // No change to project coverage 👍

Coverage data is based on head (bfd4596) compared to base (4b97145).
Patch has no changes to coverable lines.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2727   +/-   ##
=======================================
  Coverage   56.67%   56.67%           
=======================================
  Files         956      956           
  Lines        9237     9237           
  Branches     1894     1894           
=======================================
  Hits         5235     5235           
  Misses       3591     3591           
  Partials      411      411           

Flag	Coverage Δ
addon-charts	73.64% <ø> (ø)
addon-doc	19.12% <ø> (ø)
addon-editor	28.82% <ø> (ø)
addon-mobile	∅ <ø> (∅)
addon-table	83.78% <ø> (ø)
addon-tablebars	∅ <ø> (∅)
cdk	62.87% <ø> (ø)
core	62.86% <ø> (ø)
kit	61.50% <ø> (ø)
summary	56.67% <ø> (ø)

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[well-done-bot]