Added 2 tests related to multi Client - single SG replication

[vipbhardwaj]

These tests come from this specific file and line, and the test below this.
Now I have not added nothing new in the client/sec/cbltest/api directory files, nor have I done anything else in other files.

This is just a plain and simple addition in spec/tests/QE and tests/QE dir.
I've only just used the functions in main, since I have branched off main to this current branch. Hence it can safely be merged to main.

[vipbhardwaj]

Thank you for the thorough review @RIT3shSapata and @borrrden , the more the PR backlog thins out, the lesser the divergence would be of syncgateway.py amongst all pending PRs and main. Since I always rebase main onto a BACKLOG branch which needs main's (global) code to be in sync and needs its own local code to help the tests work.

I think the issue we are seeing related to the PR's local file version having a diff from main is just positional, as to why, because at say line 'X' has some code globally, ie, in main, before I rebase, the local version of it has some new function at line 'X' since I add it manually.

• Some PR then gets merged, hence main has a different code at 'X' line vs the pending PR still.
• Then when I rebase, line 'X's code is decided mostly by the rebase-er logic by git so I am not sure as to why is a certain line not matching in a certain PR.
  If I am misunderstanding this and you actually meant something else, @borrrden , we can discuss this further, maybe there's another way to rebase than what I've been doing.
  I've left "pull+merge" long back since it brings in a history of commits and file changes that I never did in a PR.
  Maybe I need to read on rebase a bit more too as-to-how to do a rebase such that for every line 'X' the code local == code global on that line? 🤔