fix: Change CreatedBy tag logic in bicep

[NirajC-Microsoft]

Purpose

This pull request updates the logic for setting the default value of the createdBy parameter in the infra/main.bicep file. The change improves how the value is determined based on the properties available in the deployer() object.

Parameter handling improvement:

• Changed the default assignment for the createdBy parameter to check for the presence of userPrincipalName in the deployer() object. If present, it uses the username part; otherwise, it falls back to using objectId.
• ...

Does this introduce a breaking change?

• Yes
• No

Golden Path Validation

• I have tested the primary workflows (the "golden path") to ensure they function correctly without errors.

Deployment Validation

• I have validated the deployment process successfully and all services are running as expected with this change.

What to Check

Verify that the following are valid

• ...

Other Information

[github-actions]

🎉 This PR is included in version 1.1.1 🎉

The release is available on GitHub release

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