Closes#7463,closes#6362

Resolves issue where shapes referenced to thedomain of an axis id containing a zero (e.g.ref: 'x10 domain') were not clipped to the boundaries of the subplot, as they should have been.

Also adds an image mock for this issue to prevent regression.

Thanks to@Ike-lag and@DataScienceIsCool for reporting, and to@Ike-lag for identifying the faulty regex in the codebase!

Before:

After:

Steps for testing

1. View the newzz_shapes_clipping_double_digit_subplots mock in the devtools dashboard (after runningnpm run build) and make sure the shapes in the lower-left subplot do not extend beyond the subplot boundaries
2. If you want to see what the mock looks like onmaster, check outmaster, copy over thezz_shapes_clipping_double_digit_subplots.json file into the mocks dir, runnpm run build and then check the mock in the devtools dashboard.