add new validaters for new quickstarts - pubsub

[tanvigour]

Signed-off-by: tanvigour tanvi.gour@gmail.com

Description

Please explain the changes you've made

Issue reference

We strive to have all PRs being opened based on an issue, where the problem or feature have been discussed prior to implementation.

Please reference the issue this PR will close: #551

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• The quickstart code compiles correctly
• You've tested new builds of the quickstart if you changed quickstart code
• You've updated the quickstart's README if necessary
• If you have changed the steps for a quickstart be sure that you have updated the automated validation accordingly. All of our quickstarts have annotations that allow them to be executed automatically as code. For more information see mechanical-markdown. For user guide with examples see Examples.

[paulyuk]

lgtm. thank you for the huge contribution of tests here.

Note I was wondering why C# and Java are not a part of this but @tanvigour and Hal explained the reliability of the test beds for those app types is not there, and will destabilize currently.