Kernel selection fails for first several seconds while it's launching the kernel in the background

[MSeal]

Application or Package Used
State which application or package this affects. For example: nteract desktop, nteract web, nteract on jupyter, etc.

nteract on jupyter

Describe the bug
A clear and concise description of what the bug is.

When loading a notebook for the first time it states the notebook is disconnected. When you run a cell you can get this message and a halted execution:

Execute failed
There is no connected kernel for this content.

if the kernel doesn't start fast enough. A second after this message the kernel in the bottom left says it's now idle and rerunning the cell succeeds.

To Reproduce
Steps to reproduce the behavior:

1. Launch nteract
2. Load a python3 notebook
3. Run the first cell
4. See error message
5. See kernel idle message in bottom left right after

Expected behavior
A clear and concise description of what you expected to happen.

First executions should await the kernel being ready after firing a launch request, rather than trying immediately and failing while the kernel is launching.

Screenshots
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Desktop (please complete the following information):

• OS: Ubuntu 20.04
• Browser Chrome
• Version current master branch

Additional context
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[stale]

This issue hasn't had any activity on it in the last 90 days. Unfortunately we don't get around to dealing with every issue that is opened. Instead of leaving issues open we're seeking to be transparent by closing issues that aren't being prioritized. If no other activity happens on this issue in one week, it will be closed.
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