[Service Connector] Fix Azure/azure-cli-extension#7235: `az containerapp connection`: Create postgresql-flexible

[dbroeglin]

{containerapp} Update CLI commands to explicitly use JSON output format.

Related command az containerapp connection create postgres-flexible

Description<4!--Mandatory--> Update CLI commands to explicitly use JSON output format. This fixes the issue described in Azure/azure-cli-extension#7235 but other commands might have similar issues.

Testing Guide Change the default format: az config set core.output=table

Run : az containerapp connection create postgres-flexible ...

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️✔️AzureCLI-BreakingChangeTest

️✔️Non Breaking Changes

[yonzhan]

Thank you for your contribution! We will review the pull request and get back to you soon.

[zhoxing-ms]

Could you add some test cases for this PR?

[zhoxing-ms]

@dbroeglin Any update?

[dbroeglin]

@zhoxing-ms I don't have much bandwidth right now. I believe non regression would be covered by existing tests. I will try to schedule some time in March to work on tests.

[zhoxing-ms]

@dbroeglin OK, could we move it's release to the next sprint (04-02)?