Fix duplicate message rendering

[RafaelJCamara]

Description

The line that was causing the duplication was:
0 => new(EventData.PayloadNames[0], EventData.Payload[0])

So I got rid of it.

Also, I assumed that this line was a part of the Count property, which was 5 before, and I reduced it to 4 now.

Based on this, I also slide down the indices of the index switch.

Before:

After:

Fixes partially #2967

Checklist

• Is this feature complete?
  • Yes. Ready to ship.
  • No. Follow-up changes expected.
• Are you including unit tests for the changes and scenario tests if relevant?
  • Yes
  • No
• Did you add public API?
  • Yes
    • If yes, did you have an API Review for it?
      • Yes
      • No
    • Did you add <remarks /> and <code /> elements on your triple slash comments?
      • Yes
      • No
  • No
• Does the change make any security assumptions or guarantees?
  • Yes
    • If yes, have you done a threat model and had a security review?
      • Yes
      • No
  • No
• Does the change require an update in our Aspire docs?
  • Yes
    • Is this introducing a breaking change?
      • Yes
        • Link to aspire-docs issue (please use this breaking-change template):
      • No
        • Link to aspire-docs issue (please use this doc-idea template):
  • No

Microsoft Reviewers: Open in CodeFlow

[RafaelJCamara]

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