Migrate tests from existing backends

[krlmlr]

• RMySQL
• RPostgres
• RSQLite
• Open pull requests

Ensure that all lines covered by master are covered after removing the tests.

[krlmlr]

Migration of tests from pull requests postponed.

[krlmlr]

Previously covered lines in RSQLite:

8d8
< R/datasetsDb.R:17
--
35d69
< R/query.R:64

And some more lines in sqlite.c, which is already very well tested.

For the other backends, all previously covered lines are still covered.

[github-actions]

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