Tests/Tokenizer: make it easier to debug recurseScopeMap() default keyword tests

[rodrigoprimo]

Description

As discussed in #813 (review), this PR appends the test marker's name to the end of each assertion's $message. This should make it easier to identify which test case caused a given test to fail.

Suggested changelog entry

N/A

Related issues/external references

Follow up to #813

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
  • This change is only breaking for integrators, not for external standards or end-users.
• Documentation improvement

PR checklist

• I have checked there is no other PR open for the same change.
• I have read the Contribution Guidelines.
• I grant the project the right to include and distribute the code under the BSD-3-Clause license (and I have the right to grant these rights).
• I have added tests to cover my changes.
• I have verified that the code complies with the projects coding standards.
• [Required for new sniffs] I have added XML documentation for the sniff.

[jrfnl]

Thanks @rodrigoprimo LGTM.