fix: correct handling of removed targets (#9824)

# Which Problems Are Solved

In Actions v2, if a target is removed, which is still used in an
execution, the target is still listed when list executions.

# How the Problems Are Solved

Removed targets are now also removed from the executions.

# Additional Changes

To be sure the list executions include a check if the target is still
existing.

# Additional Context

None

Co-authored-by: Livio Spring <livio.a@gmail.com>

internal/query/execution_targets.sql

@@ -1,11 +1,15 @@
-SELECT instance_id,
-       execution_id,
+SELECT et.instance_id,
+       et.execution_id,
        JSONB_AGG(
                JSON_OBJECT(
-                       'position' : position,
-                       'include' : include,
-                       'target' : target_id
-                   )
-           ) as targets
-FROM projections.executions1_targets
-GROUP BY instance_id, execution_id
+                       'position' : et.position,
+                       'include' : et.include,
+                       'target' : et.target_id
+               )
+       ) as targets
+FROM projections.executions1_targets AS et
+         INNER JOIN projections.targets2 AS t
+                    ON et.instance_id = t.instance_id
+                        AND et.target_id IS NOT NULL
+                        AND et.target_id = t.id
+GROUP BY et.instance_id, et.execution_id