enhancement(connection): optimize error message when testing the connection to an OceanBase backup instance

[MarkPotato777]

What type of PR is this?

type-enhancement module-connection

What this PR does / why we need it:

This PR refined the error message when testing the connection to an OceanBase instance. If it is OBOracle mode and executes SELECT USER_ID FROM ALL_USERS WHERE ROWNUM < 1, if it's a backup instance, then it will cause an error message 'ErrorCode = 16000, SQLState = HY000, Details = ORA-16000: standby cluster support weak read only'. We catch this message and then inform users to set ob_read_consistency to WEAK in Advanced Settings.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Additional documentation e.g., usage docs, etc.:

[yhilmare]

how about provide a impl of ConnectionAdapter to determine whether a datasource is standby cluster?