Updated TFM for all the sample apps to .NET 9 and updated the README

[pegasus-lynx]

Fixes : #723

Description

In this PR, I have updated the TFM for all the sample apps to .NET 9 and similarly updated the README.

In the README :

• Dead Links are removed.
• References to reflect current SDK is updated.
• References to outdated SDKs are removed.

Microsoft Reviewers: Open in CodeFlow

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