Set SAAS Gitlab url if endpint is not defined

[vinokurig]

What does this PR do?

Fixes a bug when having gitlab and github oauth configured and GitHub oauth token is fetched, Server Exception is thrown.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

fixes eclipse-che/che#23211

How to test this PR?

1. Deploy che with the pull request image: quay.io/eclipse/che-server:pr-733
2. Configure GitHub oauth.
3. Configure Gitlab oauth.
4. Start a workspace from a GitHub repository with a devfile.
5. Go back to the dashboard page and refresh the page
6. See: Dashboard loads successfully.

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

Release Notes

N/A

Reviewers

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

[ibuziuk]

@vinokurig can we possibly add a test for that?

[vinokurig]

@ibuziuk

can we possibly add a test for that?

done

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: ibuziuk, vinokurig

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[devstudio-release]

Build 3.18 :: server_3.x/369: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: sync-to-downstream_3.x/7956: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: get-sources-rhpkg-container-build_3.x/8034: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: push-latest-container-to-quay_3.x/5015: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: get-sources-rhpkg-container-build_3.x/8034:

server : 3.x :: Build 65554675 : quay.io/devspaces/server-rhel8:3.18-8
SUCCESS; copied to quay; /DS_CI/push-latest-container-to-quay_3.x/5015 triggered

[devstudio-release]

Build 3.18 :: update-digests_3.x/7883: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: server_3.x/369:

Upstream sync done; /DS_CI/sync-to-downstream_3.x/7956 triggered

[devstudio-release]

Build 3.18 :: operator-bundle_3.x/3763: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: sync-to-downstream_3.x/7957: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: get-sources-rhpkg-container-build_3.x/8035: Console, Changes, Git Data

[devstudio-release]

Build 3.18 :: get-sources-rhpkg-container-build_3.x/8035:

devspaces-operator-bundle : 3.x :: Failed in 65555982 : BREW:BUILD/STATUS:UNKNOWN
FAILURE:; copied to quay