wait for app property queries by list to return results in UI app registration creation

[glennmusa]

Description

There's transient issues when setup_ezdeploy.sh attempts to source the App Registration password to store in KeyVault in AzureUsGovernment. This change adds a "wait for an app registration property query to return a result" function that hopes to prevent the query for app registration by ID from az ad app credential reset on L110 from failing.

The underlying AZ CLI implementation queries for service principal by name:

https://github.com/Azure/azure-cli/blob/a4582a388033dde268fad640656acfe1a5781a64/src/azure-cli/azure/cli/command_modules/role/custom.py#L1703

Issue reference

The issue this PR will close: #144

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Code compiles or validates correctly
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• All tests pass (manual and automated)
• The documentation is updated to cover any new or changed features
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• Relevant issues are linked to this PR