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test: get rid of long tests

See details in #10840, in short:

- There are no precise criteria to distinguish long tests from
  other tests. Often it's a matter of taste: it feels like some
  tests take longer than others.
- The mark "long" will not be likely to be removed, even if it is
  no longer such.
- Splitting tests into long and short makes testing more difficult
  and reduces the frequency of running some tests.

The patch removes `long` markers in tests and merges test suite
`engine_long` with "long" tests together with the `engine` suite.

Note, the test `vinyl/select_consistency.test.lua` was marked as
"long", it is gone in commit 153463df11b3
("test: drop vinyl/select_consistency.test.lua").

Closes #10840

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