Tests: Allow `dbDelta()` tests to (mostly) run on MySQL 8.0.11+.

* MySQL 8.0.11 changed the `GeometryCollection` data type name to `GeomCollection`, with the latter being the preferred name.
* MySQL 8.0.17 removed support for the display width attribute for integer data types. Previously, default display width of 20 digits was used: `BIGINT(20)`.

The affected tests now check the MySQL server version and use the appropriate data types.

This leaves one unresolved failure on MySQL 8.0.17+ to be addressed in the future, caused by the same `BIGINT` display width discrepancy coming from `wp_get_db_schema()`.

Props kaggdesign, ottok, jeremyfelt, SergeyBiryukov.
Fixes #44384, #49344. See #49364.
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git-svn-id: https://core.svn.wordpress.org/trunk@46984 1a063a9b-81f0-0310-95a4-ce76da25c4cd