Remove partner brand reference from test fixtures

[dgjlindsay]

Summary

• Base-plugin unit tests used a specific partner overlay's product name as a payment-title fixture; replaced with a generic placeholder in 5 test files.
• Tests only verify title-rendering logic, not any real brand string, so behavior is unaffected.

Test plan

• Ran the 5 affected PHPUnit files locally (18 tests, all pass)

[claude]

Straightforward test-fixture cleanup — string-only changes to 5 unit test files, no application code or assertion logic touched, no critical issues found.

Ready for human approval ✅

[dgjlindsay]

Self-review: diff is a 1:1 fixture-string swap across 5 files — every input (setData) paired with its matching assertion (assertSame) updated consistently, no test logic changed. Ran the 5 affected PHPUnit files locally: 18 tests / 31 assertions, all pass. CI green (one DI compile (PHP 8.5, Magento 2.4.9) run hit an unrelated OOM/infra failure — exit code 137 on setup:di:compile — confirmed flaky by rerun, which passed clean).

by Claude