Do not mark SQLite tests as allowed to fail anymore

[swissspidy]

Once all our repositories' tests fully pass when running against SQLite, we should remove the continue-on-error line for them.

Main blockers there are db-command and search-replace-command, which require a lot of work for full SQLite compatibility. Also cache-command.

In other commands we adapted most tests and overall setup already.

Related:

• SQLite Compatibility config-command#167
• SQLite Compatibility search-replace-command#190
• SQLite Compatibility export-command#112
• SQLite Compatibility cache-command#92
• SQLite: Look into CUSTOM_USER_TABLE compatibility core-command#244
• size command doesn't work with SQLite db-command#243
• Add SQLite compatibility to wp db commands db-command#234