API break: link: Changing InfoIpTunnel::CollectMetadata(bool) to CollectMetadata

[cathay4t]

The IFLA_IPTUN_COLLECT_METADATA is zero length flag attribute

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.66%. Comparing base (1fb4bd7) to head (220c30e).
⚠️ Report is 52 commits behind head on main.

Files with missing lines	Patch %	Lines
src/link/link_info/iptunnel.rs	33.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   68.10%   68.66%   +0.55%     
==========================================
  Files         144      146       +2     
  Lines       10103    10525     +422     
==========================================
+ Hits         6881     7227     +346     
- Misses       3222     3298      +76     

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[gemini-code-assist]

Code Review

This pull request updates the handling of the IFLA_IPTUN_COLLECT_METADATA attribute in IP tunnels to treat it as a zero-length flag. Feedback highlights a correctness issue where serializing CollectMetadata(false) will still send the flag to the kernel, causing it to be interpreted as true. It is recommended to either convert CollectMetadata to a unit variant or add an assertion to prevent silent misconfiguration.

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