Exclude changelogs from base coverage reports (#1962)

These files are frequently modified and not usually relevant to tests.
When modified, they appear as not covered in the reports. With this
change we avoid showing them in the reports.
If in the future they are used by some test, we can add the coverage
there.

internal/testrunner/coverage.go

@@ -38,6 +38,12 @@ func GenerateBasePackageCoverageReport(pkgName, rootPath, format string) (Covera
 			return nil
 		}
 
+		// Exclude changelog from coverage reports, as changelogs are frequently modified and not
+		// relevant to tests.
+		if d.Name() == "changelog.yml" && filepath.Dir(match) == filepath.Clean(rootPath) {
+			return nil
+		}
+
 		fileCoverage, err := generateBaseFileCoverageReport(repoPath, pkgName, match, format, false)
 		if err != nil {
 			return fmt.Errorf("failed to generate base coverage for \"%s\": %w", match, err)