feat: BitBucket Cloud: add support for webhook secrets

[almightyfoon]

what

Added support for Bitbucket Cloud Webhook secrets. Bitbucket added support in the cloud offering in October of 2023 Announcement

• Ported the request validation libraries from bitbucket server to bitbucket cloud client.
• Removed error check and associated test to ensure they aren't being used because they weren't supported

why

There is an open request for this #3909 and I'm also in need of this feature.

tests

I ran make test, the logic is the same as bitbucketserver.

references

• Fixes Add support for bitbucket cloud webhook secrets #3909

[pavankumar-go]

kindly get this change merged. we are in very much need for this feature.

[X-Guardian]

@almightyfoon, can you resolve the conflicts on this PR?

[github-actions]

This issue is stale because it has been open for 1 month with no activity. Remove stale label or comment or this will be closed in 1 month.

[marwan38]

Gentle bump, would be nice to have this.

[jamengual]

Very little work needs to be done to get this merged, if anyone can pick it up and finish the changes we could get this merged.

[almightyfoon]

Sorry for the delay, real life got in the way. Working on clearing the failed tests.

[jamengual]

@almightyfoon do you have time to finish this? Thanks.

[X-Guardian]

Hi @almightyfoon, can you take a look at the linting error:

 server/controllers/events/events_controller.go:235:54:
 printf: non-constant format string in call to (*github.com/runatlantis/atlantis/server/controllers/events.VCSEventsController).respond (govet)

[X-Guardian]

I fixed the linting issue.

LGTM

[Almenon]

Thanks!