...to deal with various error conditions.

If the csi on my machine gets corrupted by patching, I'd still like the
bootstrap to work so I can get a csi and install.csx back to a good state.

This test has been changed twice, first time was using DateTime, second was using Stopwatch. From my testing, both have a slightly different opinion than to Environment.TickCount as to how long has passed by 1 - 3 milliseconds. Environment.TickCount on my box has a resolution of 15/16 milliseconds accuracy, but Stopwatch and DateTime both found that these same 15/16 milliseconds took between 14 -> 16 milliseconds.

Instead of accounting for this, I just changed this test to use the same clock as the underlying service.

The previous code was pulling on the Select IEnumerable twice, causing
CreateIncrementalAnalyzer to be called twice.

The current task references 14.1.0 MSBuild references, which fails
the VS design-time build, but succeeds when running MSBuild since
MSBuild has a binding redirect that VS does not.

I temporarily hacked this by ildasm/asming the DLL to downgrade
the reference to 14.0.0.

Fixes #9844.

Fixes #9759