Don't reattempt failed priming builds

[anthonyvdotbe]

Follow-up of #490

When the priming build fails, it gives me an error message for each project that failed to build. I have projects that are known to be broken. And if the extension failed to build last time, it's very unlikely that the build will pass next time I open VS Code. So the extension should remember that I dismissed the error message and not reattempt the priming build without me asking for it or opening a file in it.

Because of #490 each time I open VS Code tens of priming builds run, and because of this issue, each time I get error messages for the broken projects. This makes for a very unpleasant UX.

[sid-srini]

Hi @anthonyvdotbe. Thank you for the suggestion.

We have been tracking issues around this area, and do hope to address this, (as well as #490 and #362) in the near future.
We'll update you here once this gets implemented.

Thanks