Add a loading state when fetching usage for selected periods

[gtsiolis]

Problem to solve

Following up from https://github.com/gitpod-io/gitpod/pull/11687 and the potential improvements described in https://github.com/gitpod-io/gitpod/issues/11696, currently selecting a previous month which returns a large amount of data seems momentarily broken as the loading takes more than ~3 seconds to load and update the data table.

How to reproduce

1. Go to https://gitpod.io/t/gitpod/usage
2. Select a previous month

Proposal

Add a loading state when fetching usage for selected periods, using the same loading state of the page.

[gtsiolis]

Closing this as this is already implemented. 📕

[gtsiolis]

Opened follow up in https://github.com/gitpod-io/gitpod/issues/12358.