SLING-13101 - [Sling Models] Migrate Request, Resource, and PostConstruct Tests to JUnit 5

[bkkothari2255]

Issue: SLING-13101

Continuing the JUnit 5 migration for the org.apache.sling.models.impl package.
This PR covers 12 test classes starting with the letters P through R.

Changes

• JUnit 5 Migration:
  • Replaced MockitoJUnitRunner with @ExtendWith(MockitoExtension.class).
  • Updated all imports to org.junit.jupiter.api.
  • Replaced @Test(expected) with assertThrows.
• Modernization & Cleanup:
  • Replaced deprecated new Integer() with Integer.valueOf().
  • Updated RandomStringUtils.randomAlphabetic(10) to RandomStringUtils.secureStrong().nextAlphabetic(10).
  • Removed redundant throws clauses.
  • Added missing assertion statements where necessary.
• Strictness Handling:
  • Applied lenient() strictness to shared setup methods to preserve legacy test behavior and prevent UnnecessaryStubbingException without altering the original logic.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud