Agent Display Name Implementation

[CronkCode]

Agent Display Name Implementation

The issue or feature being addressed

Adds display name field to create/edit agent page. agent.display_name is now shown instead of agent.name in User and Management Portal.

Details on the issue fix or feature implementation

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Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• This PR needs to be cherry-picked into at least one release branch
• I have included unit tests for the issue/feature
• I have included inline docs for my changes, where applicable
• I have successfully run a local build
• I have provided the required update scripts, where applicable
• I have updated relevant docs, where applicable

[joelhulen]

Creating a new PR with a select few commits from this branch.