[MM-517]: Fixed the issue 'Unable to subscribe to groups or subgroups

[Kshitij-Katiyar]

Summary

1. Added the condition that the permission to the project will only be checked if the subscription to be created is of project-level subscription.
2. Permission for the group and sub-group is already getting checked in the ResolveNamespaceAndProject function.

Ticket Link

Fixes #517

Testing Steps

1. Create a group, sub-group, and project subscriptions.

[arush-vashishtha]

@Kshitij-Katiyar I have found an issue while testing this PR, when we create subscriptions for subgroups or projects we are getting multiple events in the channel for the subscription. Please look into this issue.

[Kshitij-Katiyar]

@Kshitij-Katiyar I have found an issue while testing this PR, when we create subscriptions for subgroups or projects we are getting multiple events in the channel for the subscription. Please look into this issue.

@arush-vashishtha This issue is not related to this PR, I would like you to log a new issue for this with all the proper reproduction steps.
The reason for this issue is an active webhook for any previously deleted subscription.
The same issue is reproducible in the Github plugin, please log the same issue there also.
If you don't see any other issue with this PR, we can merge it.

[arush-vashishtha]

@Kshitij-Katiyar I have found an issue while testing this PR, when we create subscriptions for subgroups or projects we are getting multiple events in the channel for the subscription. Please look into this issue.

@arush-vashishtha This issue is not related to this PR, I would like you to log a new issue for this with all the proper reproduction steps. The reason for this issue is an active webhook for any previously deleted subscription. The same issue is reproducible in the Github plugin, please log the same issue there also. If you don't see any other issue with this PR, we can merge it.

Sure, Everything else is working fine in this PR. I will log a new issue for this one.