{ServiceConnector}: Fix user-agent missing and getting postgres db exception

[xfz11]

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Fix Azure/azure-cli#28337
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• Have you run python scripts/ci/test_index.py -q locally? (pip install wheel==0.30.0 required)
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[azure-client-tools-bot-prd]

️✔️Azure CLI Extensions Breaking Change Test

️✔️Non Breaking Changes

[azure-client-tools-bot-prd]

Hi @xfz11,
Since the current milestone time is less than 7 days, this pr will be reviewed in the next milestone.

[yonzhan]

ServiceConnector

[xfz11]

Hi @jsntcy , could you please help merge the PR?

[azclibot]

[Release] Update index.json for extension [ serviceconnector-passwordless ] : https://dev.azure.com/azclitools/internal/_build/results?buildId=136961&view=results