Update Plugin management tests to use opencost/kompose

[yolossn]

Right now the plugin management test use the plugins from my personal repository, update them to use opencost/kompose plugins

https://github.com/headlamp-k8s/headlamp/blob/790d38c0f3ed7d2c2cfd23c3c54cbca0718bb205/plugins/headlamp-plugin/plugin-management/plugin-management.test.js#L36
https://github.com/headlamp-k8s/headlamp/blob/790d38c0f3ed7d2c2cfd23c3c54cbca0718bb205/plugins/headlamp-plugin/plugin-management/plugin-management.e2e.js#L43

Once these changes are made this exception can be removed
https://github.com/headlamp-k8s/headlamp/blob/790d38c0f3ed7d2c2cfd23c3c54cbca0718bb205/app/electron/plugin-management.ts#L315

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