…nd SPARQL

Some correction is needed in the SPARQL engine to get these tests to
pass.

References:
* RDFLib#1871

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

`_test_escapes_and_query` accidentally conflated the query "Running" as
both compiling and returning results.  This patch changes the
`query_ran` variable to `query_compiled`.

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

AJN: @aucampia suggested this patch in Pull Request discussion, and I
applied it while fixing a typo.

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Some tests are now delayed for rdflib 7, as a result of discussion of
balancing bug correction versus backwards compatibility.

Suggested-by: Iwan Aucamp <aucampia@gmail.com>
Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Signed-off-by: Alex Nelson <alexander.nelson@nist.gov>

Reported-by: Iwan Aucamp <aucampia@gmail.com>

- I moved the Turtle and JSON-LD tests to `test/data/variants` as this
  allows for further expansion and uses a shared processor which
  somewhat simplifies testing.
- I changed the JSON-LD to be compatible with Jena's riot and jsonld-cli
  as these do not allow for object valued `@type` directives. I also
  think this is in line with the JSON-LD spec.
- I changed the conditional skips to xfails, as I think this is most
  appropriate in this case, we can provide a strict flag before version
  7.0, and the strict flag's default value can be varied from release to
  release.

- Use `_comment` instead of `@x-comment` to add a comment to JSONLD.
- Fixed some typographical errors in tests.
- Remove overpinning of output to simplify things a bit.