MGDOBR-1395: add GET connectors feature

[r00ta]

MGDOBR-1395

PR owner checklist

Please make sure that your PR meets the following requirements:

• Your code is properly formatted according to this configuration.
  Run mvn clean verify -DskipTests so that imports are correctly set.
• Your commit messages are clear and reference the JIRA issue e.g: "[MGDOBR-XXX] - $clear_explanation_of_what_you_did"
• The layers in the kustomize folder have been updated accordingly.
• All new functionality is tested
• Pull Request title is properly formatted: MGDOBR-XYZ Subject
• Pull Request contains link to the JIRA issue
• Pull Request contains link to any dependent or related Pull Request
• Pull Request contains description of the issue
• Pull Request does not include fixes for issues other than the main ticket

PR reviewer(s) checklist

• Check if code and Github action workflows have been modified and if the modification is safe
• If the modification is safe, add the safe to test label

How to trigger pipelines and use the bots:

• Run the end to end pipeline
  Annotate the pull request with the label: safe to test. If you want to run the pipeline again, remove and add it again.

• Rebase the pull request
  Comment with: /rebase.

• Deploy BOT
  Comment with `/deploy <dev,stable> when the PR has been merged to deploy to a target environment.

[winklerm]

LGTM

[manstis]

LGTM 👍

The Connector related class hierarchy is working well.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
0.0% Duplication