compat: switch existing options to new for tnt-3.0

Due to the approaching tarantool 3.0 release, the following compat
options' defaults were updated to new behavior:
* yaml_pretty_multiline
* sql_seq_scan_default
* json_escape_forward_slash
* fiber_channel_close_mode
* fiber_slice_default
* box_cfg_replication_sync_timeout

Closes #8576

NO_DOC=tarantool.io compat doc doesn't state current defaults