Swapping to Twine Check - Support .md in Readme

[scbedd]

Example build: https://dev.azure.com/azure-sdk/playground/_build/results?buildId=4163

Also adding capability to ignore specific warnings during run_check_call in the helper scripts. However, at this time, I believe that it is valuable information to discover a test class with no tests present. (As test cases being present but unrun is a legitimate problem)

#4325
#4183

[codecov-io]

Codecov Report

Merging #4331 into master will decrease coverage by 0.07%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4331      +/-   ##
==========================================
- Coverage   53.62%   53.55%   -0.08%     
==========================================
  Files       10274    10267       -7     
  Lines      216095   215742     -353     
==========================================
- Hits       115884   115531     -353     
  Misses     100211   100211

Impacted Files	Coverage Δ
...zure-servicebus/azure/servicebus/common/message.py	28.63% <0%> (-7.2%)	⬇️
azure-servicebus/conftest.py	33.1% <0%> (-4.72%)	⬇️
...ge/azure/mgmt/storage/storage_management_client.py	42.95% <0%> (-3.25%)	⬇️
...te/azure/mgmt/compute/compute_management_client.py	47.29% <0%> (-2.96%)	⬇️
...rk/azure/mgmt/network/network_management_client.py	20.49% <0%> (-2.95%)	⬇️
.../mgmt/containerservice/container_service_client.py	57.74% <0%> (-2.78%)	⬇️
...t/authorization/authorization_management_client.py	66.3% <0%> (-2.39%)	⬇️
...erregistry/container_registry_management_client.py	71.79% <0%> (-2.23%)	⬇️
...servicebus/control_client/_common_serialization.py	51.41% <0%> (-2.15%)	⬇️
...t-legacy/azure/servicemanagement/_serialization.py	81.31% <0%> (-2.02%)	⬇️
... and 30 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2c53502...cbe3397. Read the comment docs.

[scbedd]

@Azure/azure-sdk-eng

[adxsdk6]

Can one of the admins verify this patch?

[adxsdk6]

Can one of the admins verify this patch?

[bsiegel]

A few suggestions

[bsiegel]

👍✨Ship It✨

Note: Please pull latest master and rebase this branch onto it before merging this pull request.

$ git checkout master
$ git pull origin master

$ git checkout -
$ git rebase master

$ git push -f