[NEOS-1409] Fix Updating Destination Connection Ids in Terraform Provider

[nickzelei]

for some reason when switching out the connection id it causes a bunch of stuff to fail.

The destinations somehow get removed and new ones created. It's all sorts of wacky.

See this test: TestAcc_Job_Pg_Pg_Destinations with the commented out config2.

_{From SyncLinear.com | NEOS-1409}