Refactor code for deprecation of "id" property

[Spomky]

The "id" property in the PublicKeyCredential is deprecated. This commit refactors the relevant code, specifically in the "PublicKeyCredential" class and several test classes, to replace the use of "Base64UrlSafe::decode($publicKeyCredential->id)" with "$publicKeyCredential->rawId". The changes are made such that the functionality is maintained but future compatibility is ensured.

Target branch: 4.9.x Resolves issue #581

• [x] It is a Bug fix
• [ ] It is a New feature
• [ ] Breaks BC
• [ ] Includes Deprecations

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud

[sonarcloud[bot]]

Quality Gate failed

Failed conditions
0.0% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud