feat!: Support installing multiple extensions

[aklinker1]

Caution

BREAKING CHANGE

Removed installFirefox and installChromium exports for now. They may be added back in a future version.

Overview

Allow passing chromiumAdditionalExtensionDirs and firefoxAdditionalExtensionDirs to install additional extensions alongside your main extension.

await run({
  extensionDir: 'demo-extension-1',
  chromiumAdditionalExtensionDirs: ['demo-extension-2'],
  firefoxAdditionalExtensionDirs: ['demo-extension-2'],
});

TODO

• Basic implementation
• How do we specify different paths for different browsers? Should that be apart of the runner, or apart of the WXT integration?

  I think I'm leaning toward adding separate fields for additionalChromiumExtensionDirs and additionalFirefoxExtensionDirs over grouping them all in extensionDirs.

• Update tests
• Break into multiple PRs

Manual Testing

cd packages/runner
bun run dev
bun run dev firefox

Both chrome and firefox should have two extensions installed, not just one.

Related Issue

This PR closes #1997

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commit: 008c1ce

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.75%. Comparing base (0315882) to head (d78ef46).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2278      +/-   ##
==========================================
+ Coverage   79.61%   79.75%   +0.13%     
==========================================
  Files         130      130              
  Lines        3812     3813       +1     
  Branches      865      866       +1     
==========================================
+ Hits         3035     3041       +6     
+ Misses        691      688       -3     
+ Partials       86       84       -2     

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