[chore] bump go-junit-report to v2

[mailo-nr]

Description

Syncs tool management with opentelemetry-collector-contrib's canonical approach (their PR #45739, Feb 2026). Replaces the old install-tools + .tools/ binary pattern with Go's tool directive and lazy go tool -n resolution — tools build on first use, no pre-building or binary naming logic needed. This also absorbs two stuck Renovate PRs (#232, #299) that broke under the old pattern.

Two divergences from contrib, both documented in code: go -C instead of -modfile= (local replace directives), and retained blank imports in tools.go (go-licence-detector skips indirect deps).

Link to tracking issue

Testing

Full CI.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 62.39%. Comparing base (8451024) to head (72cbe7d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #303   +/-   ##
=======================================
  Coverage   62.39%   62.39%           
=======================================
  Files          70       70           
  Lines        5739     5739           
=======================================
  Hits         3581     3581           
  Misses       1962     1962           
  Partials      196      196           

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