Update PrintLintViolations output

[daghack]

Updates the output of the PrintLintViolations to begin with the violation rule name, print the ULR inline to the name if it exists, and remove the printing of the Detail field, which is redundant when printing the Description.

Old:

- 'as' and 'FROM' keywords' casing do not match
The 'as' keyword should match the case of the 'from' keyword
Dockerfile:1
--------------------
   1 | >>> FROM scratch as base
   2 |     copy Dockerfile .
   3 |
--------------------

- Command 'copy' should match the case of the command majority (uppercase)
All commands within the Dockerfile should use the same casing (either upper or lower)
Dockerfile:2
--------------------
   1 |     FROM scratch as base
   2 | >>> copy Dockerfile .
   3 |
   4 |
--------------------

Updated:

FromAsCasing
The 'as' keyword should match the case of the 'from' keyword
Dockerfile:1
--------------------
   1 | >>> FROM scratch as base
   2 |     copy Dockerfile \
   3 |
--------------------

NoEmptyContinuations - https://github.com/moby/moby/pull/33719
Empty continuation lines will become errors in a future release
Dockerfile:4
--------------------
   2 |     copy Dockerfile \
   3 |
   4 | >>> .
   5 |     copy .dockerignore .
   6 |
--------------------