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'@backstage/plugin-techdocs': minor
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Add a message if techdocs takes long time to load

Fixes #2416.

The UI after the change should look like this:

![techdocs-progress-bar](https://user-images.githubusercontent.com/33940798/94189286-296ac980-fec8-11ea-9051-1b3db938d12f.gif)
