fix: update aiSearchName variable to use solutionSuffix instead of solutionName

[Vamshi-Microsoft]

This pull request updates the AI service resource naming convention and system prompt formatting in the infrastructure templates to improve consistency and reliability. The most important changes are grouped below:

Resource Naming Consistency

• Changed aiSearchName to use solutionSuffix instead of solutionName in both infra/main.bicep and infra/main.json, ensuring consistent naming across resources. [1] [2]
• Updated SQL server FQDN and related resource names to use solutionSuffix for improved alignment and easier environment management.

System Prompt Formatting

• Reformatted prompt strings in infra/main.json to use Windows-style line endings (\r\n) for improved compatibility and readability.

Template Metadata

• Updated the templateHash in infra/main.json to reflect the new template version after changes.

Purpose

• ...

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

• ...

[github-actions]

🎉 This PR is included in version 1.9.0 🎉

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