No error message for long/timed out requests

[TimboTambo]

No error message for long/timed out requests

Currently on the products site, when a request to Azure takes a long time, we do not cancel the request or show any kind of messaging. This would typically be when Azure goes down.

To Reproduce

Steps to reproduce the behaviour:

1. Set network speed to slow (e.g. 2G)
2. Make a request/search, especially on the substance/product index pages
3. Observe no visual feedback about state of request

Expected behaviour

An error message is shown when the browser is unable to get a response from Azure/medicines API

Screenshots

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Additional context

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