Fix WorkflowExecution identifier format in `functional_annotation_agg` invalid example file (berkeley-schema-fy24)

[bmeluch]

See microbiomedata#220 (comment).

This should be a WorkflowExecutionIdentifier, something about the pattern constraint is not being applied as expected, revisit after nmdc-schema is backmerged into berkeley-schema-fy24.

[aclum]

There is a pattern constraint on metagenome_annotation_id so this can be closed.

https://microbiomedata.github.io/berkeley-schema-fy24/FunctionalAnnotationAggMember/