Add isNullOrEmpty check to the BitbucketServerURLParser

[vinokurig]

What does this PR do?

Add isNullOrEmpty check to the BitbucketServerURLParser. The che.integration.bitbucket.server_endpoints named parameter can be initialised as an empty string from the corresponding environment variable.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

fixes eclipse-che/che#22798

How to test this PR?

1. Deploy che from the PR image: quay.io/eclipse/che-server:pr-653.
2. Setup Bitbucket Cloud oauth secret.
3. Add BitBucket Server Personal Access token.
4. Start a workspace from the Bitbucket Server repository with a devfile.

See: Workspace starts 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

Reviewers

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

[vinokurig]

/retest

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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

The full list of commands accepted by this bot can be found here.

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
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[devstudio-release]

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server : 3.12 :: Build 58721662 : quay.io/devspaces/server-rhel8:3.12-31
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server : 3.x :: Build 58722159 : quay.io/devspaces/server-rhel8:3.13-2
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devspaces-operator-bundle : 3.x :: Build 58722809 : quay.io/devspaces/devspaces-operator-bundle:3.13-8
SUCCESS; copied to quay; /DS_CI/push-latest-container-to-quay_3.x/4319 triggered;

Bundle CSV related images:
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- quay.io/devspaces/configbump-rhel8:3.13-1
- quay.io/devspaces/dashboard-rhel8:3.13-2
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- quay.io/devspaces/traefik-rhel8:3.13-1
- quay.io/devspaces/udi-rhel8:3.13-2
= registry.redhat.io/openshift4/ose-kube-rbac-proxy:v4.12.0-202401190520.p0.gb17014f.assembly.stream
= registry.redhat.io/openshift4/ose-oauth-proxy:v4.12.0-202401190520.p0.g03e5b13.assembly.stream
= registry.redhat.io/rhscl/mongodb-36-rhel7:1-50
= registry.redhat.io/ubi8/ubi-minimal:8.8-1072.1697626218

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Build container: devspaces-operator-bundle synced; /DS_CI/get-sources-rhpkg-container-build_3.x/6107 triggered; /job/DS_CI/job/dsc_3.x triggered;

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Detected new images: rebuild operator-bundle
* server; /DS_CI/operator-bundle_3.x/2648 triggered

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3.13.0-CI

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Build 3.13 :: copyIIBsToQuay/2469:

3.13
arches = x86_64, s390x, ppc64le;
  * LATEST DS OPERATOR BUNDLE = <a href=https://quay.io/repository/devspaces/devspaces-operator-bundle?tab=tags>registry-proxy.engineering.redhat.com/rh-osbs/devspaces-operator-bundle:3.13-8
  * LATEST DWO OPERATOR BUNDLE = <a href=https://quay.io/repository/devworkspace/devworkspace-operator-bundle?tab=tags>registry-proxy.engineering.redhat.com/rh-osbs/devworkspace-operator-bundle:0.21-7
+ s390x-rhel8 IIB(s) copied:
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  + quay.io/devspaces/iib:3.13-v4.15-s390x
  + quay.io/devspaces/iib:next-v4.15-s390x
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+ x86_64-rhel8 IIB(s) copied:
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  + quay.io/devspaces/iib:3.13-v4.14-665356-533291-x86_64
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  + quay.io/devspaces/iib:next-v4.13-x86_64
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  + quay.io/devspaces/iib:next-v4.12-x86_64
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