Fix landings stream to be incremental

[loeakaodas]

Description of change

• Fix landings stream to be incremental as per TDL-16356
• closes #56
• closes #54

Manual QA steps

• ran tap locally
• ran against singer-check-tap and target-stitch --dry-run
• ran tap-tester locally
• tests passing in circle

Risks

• minimal, the stream will now be incremental

Rollback steps

• revert this branch

[MarcosPala]

Any status on this?

[loeakaodas]

Any status on this?

@KrisPersonal @luandy64 could this be merged? it fixes an issues for clients in Stitch and is passing tests.