.Net: Fixing ConversationSummaryPlugin's ActionItems response by improving underlying prompt

[zeecorleone]

Fixing ConversationSummaryPlugin's ActionItems response by improving underlying prompt

Motivation and Context

1. Why is this change required?
   This change is required in order to fix reported issue: 4843
   The change improves the prompt behind the "GetConversationActionItems" function of "ConversationSummaryPlugin", in order to get expected/correct results.

2. What problem does it solve?
   The "GetConversationActionItems" doesn't return expected result. It even did not return as expected by the MS Learning path samples. Upon checking the issues, I found Issue 4843 already opened against it, so I tried to find the root cause of this behavior and fix it.

Description

The change improves the prompt behind the "GetConversationActionItems" function of "ConversationSummaryPlugin", in order to get expected/correct results.

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄

[zeecorleone]

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[zeecorleone]

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