repl: Correctly discover user's kernels

[raideno]

Closes #50977

Before you mark this PR as ready for review, make sure that you have:

• Added a solid test coverage and/or screenshots from doing manual testing
• Done a self-review taking into account security and performance aspects
• Aligned any UI changes with the UI checklist

Before:

After:

Release Notes:

• Fixed kernels discovery in python notebook editor.

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[raideno]

@cla-bot check

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @raideno on file. You can sign our CLA at https://zed.dev/cla. Once you've signed, post a comment here that says '@cla-bot check'.

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[raideno]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[raideno]

@rgbkrk please, could you review the changes whenever you have time ? thanks a lot.

[MrSubidubi]

Nice, thanks! And congratulations to your first contribution!