feat: Update avm/res/service-bus/namespace - Add support for AKV secrets export

[weikanglim]

Description

Closes #3638

Pipeline Reference

Verified locally:

Type of Change

• Update to CI Environment or utilities (Non-module affecting changes)
• Azure Verified Module updates:
  • Bugfix containing backwards-compatible bug fixes, and I have NOT bumped the MAJOR or MINOR version in version.json:
    • Someone has opened a bug report issue, and I have included "Closes #{bug_report_issue_number}" in the PR description.
    • The bug was found by the module author, and no one has opened an issue to report it yet.
  • Feature update backwards compatible feature updates, and I have bumped the MINOR version in version.json.
  • Breaking changes and I have bumped the MAJOR version in version.json.
  • Update to documentation

Checklist

• I'm sure there are no other open Pull Requests for the same update/change
• I have run Set-AVMModule locally to generate the supporting module files.
• My corresponding pipelines / checks run clean and green without any errors or warnings

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[AlexanderSehr]

Great work @weikanglim - content-wise nothing to complain about at all. The suggestions I added were all just minor details to align with the spec, address a very new bicep warning & format the export file 💪

Please note: After commiting the changes (which you can do via the GitHub UI) you'll have to re-run the Set-AVMModule --Path '(...)' Recurse function to regenerate the readme & json files. Thank you

[AlexanderSehr]

Thank you for the updates @weikanglim, I'll leave the final review to the module's owner @ChrisSidebotham 💪

[weikanglim]

Hey @ChrisSidebotham , let me know if this looks good to you ! Thanks for reviewing