backport PR 12886 - improvement Tabs extension point

[aalves08]

Summary

Fixes #13166

Occurred changes and/or fixed issues

• Backport PR Fix Unable to add extension tab to Edit Storage Class page #12886
• Bump shell version

Technical notes summary

Areas or cases that should be tested

Check repro steps on original PR #12886

Areas which could experience regressions

Screenshot/Video

Checklist

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[aalves08]

@jordojordo If you think there's any relevant change on this PR that wasn't on my PR proposal, we might need to add it to master as well since I "copied" the original PR and tested it, so any change you do won't be reflected on master 🙏

[jordojordo]

@aalves08 That's fine with me, I was just testing to see if updating the actions/upload-artifact version would fix the gates. I see you added those updates to both of these 2.9 and 2.8 PRs, we should probably do this in master as well.

As for the change in fleet.catalog.cattle.io.gitrepo.vue, the unmounted hook is specific to Vue 3, beforeDestroy or destroyed would be the Vue 2 equivalent. I don't believe we would need to forward port this, and I'm not even sure if this is necessary, I was mostly testing to see if the gates passed.