Katas taking 4+ mins to execute on binder

[anpaz]

For some reason, after updating to the latest QDK and launching the Katas in Binder, trying to run a %kata cell takes 4+ minutes.

We're currently investigating this.

[cgranade]

@crazy4pi314 has reported that this affects non-kata code as well, so I'm moving this issue to the iqsharp repo to track any issue with the image itself.

[cgranade]

As per @anpaz-msft's report, it appears as though the affected image is mcr.microsoft.com/quantum/iqsharp-base:0.10.1912.0501, and that mcr.microsoft.com/quantum/iqsharp-base:0.10.1911.1607 works well on mybinder.org. Both images seem to work well when running the images locally.

[rmshaffer]

Two fixes have been made here:

• in the base IQ# image: 84bfc6b
• in the Katas image, by @vxfield: microsoft/QuantumKatas@6ddf604

Performance on MyBinder is much improved with these two fixes. First cell execution times are typically only a couple of seconds or less.