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test: speed-up the sort data machinery test

We used to have all supported and unsupported index types in different
tests. This has a downside of slowing down the suite execution time as
a lot of time is wasted during the Tarantool boot-up. This commit has
merged some tests:
1. Supported and unsupported indexes are tested in `test_index_build`.
   This one creates local and vinyl spaces and does a few inserts in
   the WAL, so the corresponding separated tests are dropped.
2. The cases prohibiting the new SK build approach (index and space
   `before_replace` triggers, unexisting sort data file) are tested
   in `test_fallback_cases`.
3. Snapshot creation when one or both of .snap and .sortdata files are
   absent is tested in the `test_checkpoint` instead of separate tests.
4. The snapshot failures both on .snap write and creation of .sortdata
   file are tested in `test_checkpoint_failures`.
5. Two MVCC tests are merged into one with two spaces.

Also, the invalid sort data file test has been modified so that the
test Tarantool instances are ran concurrently, thus reducing the wait
overhead.

Merged identical test groups by the way.

Closes #11772

NO_DOC=test update
NO_CHANGELOG=test update

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