CMFActivity: remove obsolete/unused Z SQL Methods

product/CMFActivity/skins/activity/SQLDict_readUidList.zsql

-<dtml-comment>
-title:
-connection_id:cmf_activity_sql_connection
-max_rows:1000
-max_cache:0
-cache_time:0
-class_name:
-class_file:
-</dtml-comment>
-<params>
-method_id
-path
-</params>
-SELECT uid FROM
-    message
-WHERE
-    processing = 0
-<dtml-if expr="method_id is not None"> AND method_id = <dtml-sqlvar method_id type="string"> </dtml-if>
-<dtml-if expr="path is not None"> AND path = <dtml-sqlvar path type="string"> </dtml-if>

product/CMFActivity/skins/activity/SQLQueue_processMessage.zsql

-<dtml-comment>
-title:
-connection_id:cmf_activity_sql_connection
-max_rows:1
-max_cache:0
-cache_time:0
-class_name:
-class_file:
-</dtml-comment>
-<params>uid</params>
-UPDATE
-  message_queue
-SET
-  processing_date = UTC_TIMESTAMP(),
-  processing=1
-WHERE
-  uid IN (
-<dtml-in uid><dtml-sqlvar sequence-item type="int"><dtml-if sequence-end><dtml-else>,</dtml-if></dtml-in>
-  )
-<dtml-var sql_delimiter>
-COMMIT 

product/CMFActivity/skins/activity/SQLQueue_rollback.zsql

-<dtml-comment>
-title:
-connection_id:cmf_activity_sql_connection
-max_rows:1000
-max_cache:0
-cache_time:0
-class_name:
-class_file:
-</dtml-comment>
-<params></params>
-ROLLBACK