Fix crash in execve filename parameter parsing

[Stringy]

Use lenient extraction instead of asstd::string_view() which throws when BPF probe data has unexpected trailing bytes after the null terminator. The uncaught exception propagates through sinsp::next() and aborts the collector.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Central YAML (base), Organization UI (inherited)

Review profile: CHILL

Plan: Enterprise

Run ID: 971fee69-18c4-43bb-bd3e-ff5897ea966e

📥 Commits

Reviewing files that changed from the base of the PR and between fdb2723 and 9d74644.

📒 Files selected for processing (1)

• userspace/libsinsp/parsers.cpp

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📝 Walkthrough

Summary by CodeRabbit

• Bug Fixes
  • Improved process execution event parsing when data includes trailing bytes.
  • Prevented parsing errors while preserving existing handling for unavailable or file-descriptor-based paths.

Walkthrough

The execve exit parser now extracts fallback filenames with bounded strnlen data. This avoids conversion errors when BPF parameters contain trailing bytes. Existing <NA> and file-descriptor path exclusions remain unchanged.

Changes

Exec fallback filename parsing

Layer / File(s)	Summary
Bounded fallback filename extraction userspace/libsinsp/parsers.cpp	The parser reads fallback filename data within its bounded parameter length instead of requiring an exactly null-terminated serialized string.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the main change: fixing a crash during execve filename parameter parsing.
Description check	✅ Passed	The description explains the parsing change, the cause of the crash, and its effect on collector stability.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch giles/fix-execve-filename-crash

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