Fix azd ai agent init message to suggest azd up before azd deploy

[Copilot]

After azd ai agent init completes, the output suggests running azd deploy [name] directly, which fails if infrastructure hasn't been provisioned first.

Changes

• Updated the completion message to first recommend azd up for full provisioning and deployment
• Clarified that azd deploy [name] is only valid when infrastructure is already provisioned

Before

Added your agent as a service entry named 'CalculatorAgentLG' under the file azure.yaml.
You will be able to deploy this agent using command azd deploy CalculatorAgentLG.

After

Added your agent as a service entry named 'CalculatorAgentLG' under the file azure.yaml.
To provision and deploy the whole solution, use azd up.
If you already have your project provisioned with hosted agents requirements,
you can directly use command azd deploy CalculatorAgentLG.

Original prompt

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This section details on the original issue you should resolve

<issue_title>[Issue] azd ai agent prompts to azd deploy agent, which will fail if no bicep provided</issue_title>
<issue_description>- [x] Make sure you've installed the latest version using instructions

Output from azd version
azd version 1.22.0 (commit c9ab0f2)
azd ai agent version 0.1.3-preview

Describe the bug
When completing azd ai agent init flow, the output shows:

which could be misleading because azd deploy [AGENTNAME] will work only if azd provision would succeed, and if all permissions have been setup.

Expected behavior
We could either point to azd up or remove this mention (preferred).</issue_description>

<agent_instructions>This is in regards to the following code snippet:

fmt.Printf("Added your agent as a service entry named '%s' under the file azure.yaml. You will be able to deploy this agent using command %s.\n",
agentDef.Name,
color.HiBlueString("azd deploy %s", agentDef.Name))</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@jfomhover let's replace with "To provision a project and your the whole solution, use `azd up`. If you already have your project provisioned with hosted agents requirement, you can directly use command `azd deploy [name]`"

• Fixes [Issue] azd ai agent prompts to azd deploy agent, which will fail if no bicep provided #6333

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