chore: Apply Bitbucket SAAS Oauth flow

[vinokurig]

Signed-off-by: Igor Vinokur ivinokur@redhat.com

What does this PR do?

Since we support only Bitbucket Server Oauth flow, added a support for the SAAS version

depends on eclipse-che/che-operator#1445

Screenshot/screencast of this PR

What issues does this PR fix or reference?

eclipse-che/che#21517

How to test this PR?

1. Deploy Eclipse che with the PR image and specific operator image: chectl server:deploy -p=openshift --che-operator-image=quay.io/ivinokur/che-operator:next -i=quay.io/ivinokur/che-server:next
2. Create an oauth application in your Bitbucket account: https://support.atlassian.com/bitbucket-cloud/docs/use-oauth-on-bitbucket-cloud/
   Set <eclipse-che endpoint>/api/oauth/callback as a Callback URL
   Set all Account and Repository permissions
3. Create bitbucket oauth secret in the che-server namespace:

kind: Secret
apiVersion: v1
metadata:
  name: bitbucket-oauth-config
  namespace: eclipse-che
  labels:
    app.kubernetes.io/component: oauth-scm-configuration
    app.kubernetes.io/part-of: che.eclipse.org
  annotations:
    che.eclipse.org/oauth-scm-server: bitbucket
data:
  id:<base 64 encoded client id from the bitbucket oauth consummer>
  secret: <base 64 encoded secret from the bitbucket oauth consummer>
type: Opaque

4. Try to create a factory from a private bitbucket repository.

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[svor]

I've added a few small remarks.

Also it was tested on OS 4.10 and it works as expected:

• I was redirected to the Bitbucket authentication page:
  

• As a result my private project was cloned:
  

Just one strange behavior:
If set all permissions in the Bitbucket application:

Workspace won't start:

But i don't think it's related to the current changes

[vinokurig]

@svor

Just one strange behavior:
If set all permissions in the Bitbucket application:

Thank you for the catch, I will clarify this in the documentation part.