Add Network Path filter examples and IP URLs

[ken-schneider]

What does this PR do? What is the motivation?

Updates Network Path documentation to address two gaps:

1. Dynamic test filter visibility: The include/exclude filter configuration for Dynamic (Network Traffic) paths was documented in a standalone section but not shown in the per-platform YAML configuration examples (Linux, Windows, Helm). Users copying the YAML examples had no visibility into filter options. This PR adds commented-out filter configuration with both include and exclude examples directly in each dynamic test tab's YAML block, referencing the existing filter syntax section.

2. Source public IP allowlist: The datadog-traceroute library (v7.75+) performs a source public IP check by contacting external services over HTTPS. Users with restrictive firewall rules had no documentation on which URLs to allowlist. This PR adds a new "Source public IP resolution" section to the Network Path setup page listing all five IP check service URLs, clarifying this is optional and Network Path functions without it. Also adds a note to the Agent Network Traffic page.

Changes:

• content/en/network_monitoring/network_path/setup.md: Added commented-out filters config with both include and exclude examples in the Linux, Windows, and Helm dynamic test YAML examples. Added a new "Source public IP resolution" subsection with a v7.75+ info banner, documenting the five external URLs (icanhazip.com, ipinfo.io/ip, checkip.amazonaws.com, api.ipify.org, whatismyip.akamai.com) and clarifying this feature is optional.
• content/en/agent/configuration/network.md: Added a note under the Network Path destination entry listing the public IP check domains, noting this is optional and available in Agent v7.75+, and linking to the setup page for details.

Merge instructions

Merge readiness:

• Ready for merge

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AI assistance

Used Bits AI to investigate the datadog-traceroute Go module source code (v1.0.14) to extract the exact public IP check URLs from publicip/fetcher.go, and to draft the documentation changes.

Additional notes

The public IP check URLs were sourced from the ipCheckers variable in github.com/DataDog/datadog-traceroute/publicip/fetcher.go (v1.0.14). The filter config examples mirror the existing filter syntax section already present in the setup page.

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[datadog-datadog-prod-us1]

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Bits Dev status: ✅ Done

CI Auto-fix: Disabled | Enable

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[datadog-datadog-prod-us1]

I can only run on private repositories.

[github-actions]

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Modified Files

• https://docs-staging.datadoghq.com/dd/bits/network-path-filters-and-ip-urls/agent/configuration/network
• https://docs-staging.datadoghq.com/dd/bits/network-path-filters-and-ip-urls/network_monitoring/network_path/setup

[git-thuerk-done]

Hey @ken-schneider this looks good I just had some feedback on the filter syntax links in the code blocks, let me know when this is ready for re-review!

[git-thuerk-done]

Suggested change

	## See the [filter syntax](#filter-syntax) section for details and examples.
	## See the [filter syntax][1] section for details and examples.

This isn't linking out since it's in a code block and it's in a tab so I think you'd have to add the full URL within the tab, like:
[1]: /network-path-filters-and-ip-urls/network_monitoring/network_path/setup/?tab=linux#filter-syntax

[git-thuerk-done]

Suggested change

	## See the [filter syntax](#filter-syntax) section for details and examples.
	## See the [filter syntax](#filter-syntax) section for details and examples.

same issue with this one

[git-thuerk-done]

Suggested change

	## See the [filter syntax](#filter-syntax) section for details and examples.
	## See the [filter syntax](#filter-syntax) section for details and examples.

and this one :)