[MATRIX-1193] Add username/password option for elastic self hosted

[AitorAlgorta]

Release Notes

Breaking Changes

• PLACEHOLDER

New Features

• PLACEHOLDER

Bug Fixes

• PLACEHOLDER

Checklist

• [ ] I have successfully built and used a custom CLI binary, without linter issues from this PR.
• [ ] I have clearly specified in the What section below whether this PR applies to Confluent Cloud, Confluent Platform, or both.
• [ ] I have verified this PR in Confluent Cloud pre-prod or production environment, if applicable.
• [ ] I have verified this PR in Confluent Platform on-premises environment, if applicable.
• [ ] I have attached manual CLI verification results or screenshots in the Test & Review section below.
• [ ] I have added appropriate CLI integration or unit tests for any new or updated commands and functionality.
• [ ] I confirm that this PR introduces no breaking changes or backward compatibility issues.
• [ ] I have indicated the potential customer impact if something goes wrong in the Blast Radius section below.
• [ ] I have put checkmarks below confirming that the feature associated with this PR is enabled in:
  • [ ] Confluent Cloud prod
  • [ ] Confluent Cloud stag
  • [ ] Confluent Platform
  • [ ] Check this box if the feature is enabled for certain organizations only

What

Blast Radius

References

Test & Review

[confluent-cla-assistant[bot]]

:tada: All Contributor License Agreements have been signed. Ready to merge.
_{Please push an empty commit if you would like to re-run the checks to verify CLA status for all contributors.}

[sonarqube-confluent[bot]]

Quality Gate failed

Failed conditions
1 New issue

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