[#Wave-Control: Add NetSuite] Add support Reusing an Existing Connection via API

[yuwenmemon]

cc @shubham1206agra from https://expensify.slack.com/archives/C06ML6X0W9L/p1719862799874179

We will create a new API command to reuse an existing connection from another policy. Currently we do this via a non 1:1:1 API command via Policy_Connection_Copy that loads a policy, copies over the requested connection into the new policy, and then saves the new policy.

Instead of doing this we'll make a new Auth command that does the same thing as Policy_Connection_Copy. We will call this via a new API command - CopyExistingPolicyConnection.

This command will take in the following params:

authToken - Of the user who's initiating the sync
policyID - The policyID connected to NetSuite that we'll be copying from
targetPolicyID - The policyID of the policy we'll be copying connection data into
connectionName - The name of the connection to by copying over

[melvin-bot]

Triggered auto assignment to @dylanexpensify (NewFeature), see https://stackoverflowteams.com/c/expensify/questions/14418#:~:text=BugZero%20process%20steps%20for%20feature%20requests for more details. Please add this Feature request to a GH project, as outlined in the SO.

[dylanexpensify]

reviewing today!

[yuwenmemon]

Auth PR is ready for review about to spin up Web.