api_data currently contains some obsolete config items such as assert.write_timestamp, that should be cleaned up. The scope of this ticket is to review the contents of api_data.py and remove any dead/unused config items. To limit scope I'd recommend only reviewing whether config items are parsed via a functions like __wt_config_gets, and not whether the resulting flags (e.g. WT_DHANDLE_TS_ASSERT_READ_ALWAYS) are used in the code base.

Note that obsolete config items which are present in the metadata should not be removed, please see WT-10210 for more context.