Update Network Path overview dashboard (DataDog#22261)

* Update Network Path overview dashboard

Improve dashboard usability with cleaner titles, better link labels,
and increased result limits.

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Simplify custom link labels in Network Path dashboard

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: AlexandreYang