Refactors pytest unit tests to run against real wandb server

[kptkin]

Description

What does the PR do?

https://www.notion.so/wandbai/Un-mock-my-mock-server-0202bd99f1844ba086ab615bec9f4e57

Testing

How was this PR tested?

How do you test a test?! 🤔

[codecov]

Codecov Report

Merging #4066 (c108f5d) into master (ef0c522) will increase coverage by 2.61%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4066      +/-   ##
==========================================
+ Coverage   80.13%   82.74%   +2.61%     
==========================================
  Files         255      255              
  Lines       32269    32266       -3     
==========================================
+ Hits        25859    26700     +841     
+ Misses       6410     5566     -844     

Flag	Coverage Δ
functest	54.93% <ø> (+4.58%)	⬆️
unittest	73.50% <ø> (+0.05%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
wandb/data_types.py	82.65% <ø> (-1.76%)	⬇️
wandb/integration/prodigy/prodigy.py	95.00% <ø> (+95.00%)	⬆️
wandb/sdk/launch/runner/local_process.py	59.52% <0.00%> (-28.58%)	⬇️
wandb/integration/tensorboard/monkeypatch.py	87.65% <0.00%> (-4.94%)	⬇️
wandb/sdk/data_types/base_types/wb_value.py	93.81% <0.00%> (-2.07%)	⬇️
wandb/sdk/wandb_artifacts.py	81.78% <0.00%> (-1.26%)	⬇️
wandb/sdk/service/server_sock.py	91.87% <0.00%> (-1.02%)	⬇️
wandb/cli/cli.py	70.29% <0.00%> (-0.47%)	⬇️
wandb/sdk/interface/artifacts.py	78.89% <0.00%> (-0.35%)	⬇️
... and 54 more

[raubitsj]

🚢 Great!!!
None of my comments were blocking.