End-stop sanity check ahead of bed leveling

[bradanlane]

It would be a "nice to have" if there was an end-stop check before G29 (or perhaps starting to print).

Here is my example:

I ran a long print and everything finished. What I did not realize is that the long print caused a wire on the probe switch to break at the solder joint. The switch was now reporting "triggered" rather than "open". So my "Z" MIN and MAX end stops were not both reporting "triggered".

I would think any axis reporting both end-stops as "triggered" would indicate a fault in the printer.

Of course, this would require validation for both physical and soft end-stops so I am not sure if there are cases where both extremes reporting "triggered" might be expected. If there are cases, then perhaps just test for "G29" or similar setup-type operations.

For now, I will add local code.

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