validate - replace <link> with an actual link

[max-trunk]

On successful invocation of validate, includes a link to onboarding. Also replaces usage of log::info!() with println() for cleaner output

max@max-cloudtop:~/src/flake-factory$ ~/src/analytics-cli/target/x86_64-unknown-linux-musl/release/trunk-analytics-cli validate --junit-paths go/src/**/*.xml,rust/**/nextest/ci/*junit.xml,**/jest_*.xml
2024-11-01T18:32:14 [INFO] - Starting trunk-analytics-cli 0.0.0 (git=547be9c972c60ac72e9655ad5912304aeae64bd1) rustc=1.80.0-nightly

Validating the following 3 files:
  File set matching go/src/**/*.xml:
    go/src/gotestsum_test.xml
  File set matching rust/**/nextest/ci/*junit.xml:
    rust/target/nextest/ci/junit.xml
  File set matching **/jest_*.xml:
    tests/jest/jest_junit_test.xml

go/src/gotestsum_test.xml - 1 test suites, 3 test cases, 0 validation errors, 4 validation warnings
  OPTIONAL - report has test cases with missing file or filepath
  OPTIONAL - test case or parent has no timestamp
  OPTIONAL - test case or parent has no timestamp
  OPTIONAL - test case or parent has no timestamp
rust/target/nextest/ci/junit.xml - 1 test suites, 2 test cases, 0 validation errors, 2 validation warnings
  OPTIONAL - report has stale (> 1 hour(s)) timestamps
  OPTIONAL - report has test cases with missing file or filepath
tests/jest/jest_junit_test.xml - 1 test suites, 3 test cases, 0 validation errors, 1 validation warnings
  OPTIONAL - report has stale (> 1 hour(s)) timestamps

All 3 files are valid! (3 files with validation warnings) ✅
Navigate to https://app.trunk.io/onboarding?intent=flaky+tests to continue using Trunk Flaky Tests! 🚀🧪
max@max-cloudtop:~/src/flake-factory$