visual-diff: stabilize flaky calendar and input-time localization tests

[Margaree Peacocke]

For example https://github.com/BrightspaceUI/core/pull/1141/files?short_path=9c59ade#diff-9c59adee80e0812b3c84061cccf6e5e2222d9a8828cad758a260a3c797b7d112

These localized calendar tests have been seen to flake occasionally.

The input-time localization tests are currently commented out (it.skip) and should be re-enabled and stabilized.

[Margaree Peacocke]

Calendar localization tests should be fine now as of #1137. Keep an eye on this.

[Margaree Peacocke]

input-time re-enabled and (hopefully) stabilized here #1150