Issue #2664 : Harden pipeline unit tests (replacement notices, numeric compare, rename)

[mattcasters]

When attaching an input or golden data set, Hop Gui now shows a notice (with Don't show this message again) that the transform is replaced with an Injector or Dummy during the test. That is typically done so the unit test does not read from or write to a file or database.

Number and BigNumber golden-data comparison now formats both values with a mask derived from field length and precision (for example length 7, precision 2 uses 00000.00;-0000.00), so values like sqrt(2) and 1.4142 match at the declared precision.

If a unit test is active and you rename a transform that has an input data set, golden data set, or tweak, the location is updated so the attachment stays on the renamed transform.

Documentation for pipeline unit tests, data sets, Dummy, and Injector is updated, including screenshots of the new notices.

Fixes #2664

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