Resolve "deleteSessionByIds lambda expression is causing some issues"

What does this mr do?

See #710 (closed) for complete desc.

Actions taken to fix bug

Small change to code.

We also get rid of the lambda completely, as it's a useless layer of abstraction that can already be achieved directly just by using getAndHandle instead of getAndHandleAll

Does this MR meet the acceptance criteria?

• I adhere to the style guide.

Closes #710 (closed)