Recreate index for events with missing project target types

What does this MR do and why?

Recreate index for events with missing project target types without the pushed (5) action. This will be used for the BackfillEventsTargetTypeProject

It appears that we can't set the target_type for push events yet. There are some functionalities that depends on them having nil target_types including:

1. Clickhouse materialized view
2. Queries with index for nil target_type

The current index was added in !203765 (merged)

References

Related to #569112

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