SONARJAVA-6625 Migrate remaining tests to JUnit 5

[vdiez]

Summary

• replace the deprecated JUnit rule migration bridge with native JUnit 5 extensions and @TempDir
• migrate the shared external-report and input-file test helpers
• remove junit-jupiter-migrationsupport from all five affected modules
• keep the Java sensor telemetry assertion aligned with the migrated source it analyzes

Why

The Next quality gate reports 12 open java:S5738 issues, all caused by @EnableRuleMigrationSupport, which is deprecated and marked for removal.

Verification

• Java 26: targeted Maven reactor build across 15 modules (BUILD SUCCESS)
• 115 selected test executions: 114 passed, 1 skipped
• confirmed no EnableRuleMigrationSupport or junit-jupiter-migrationsupport references remain

[hashicorp-vault-sonar-prod]

SONARJAVA-6625

[mallory-scotton]

LGTM, just left one small nitpick.

[sonarqube-next]

Quality Gate passed

Issues
0 New issues
12 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0 Dependency risks
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarQube

[gitar-bot]

Code Review ✅ Approved

Migrates legacy JUnit 4 rules to native JUnit 5 extensions and @TempDir, resolving all S5738 deprecation issues. No issues found.

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