test(tracing): migrate off backtick operator

[morrisonlevi]

Description

Removes our own usage of the backtick operator because this operator was deprecated in PHP 8.5. This removes deprecation warnings in the logs.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-datadog-prod-us1]

 

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⚠️ Warnings

🚦 42 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-php | ASAN test_c: [8.0, arm64]     

DataDog/apm-reliability/dd-trace-php | ASAN test_c: [8.1, arm64]     

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [8.1]     

View all 42 failed jobs.

⌛ 1 Test performance regression detected

testUserSignUp from symfony-44-test.DDTrace\Tests\Integrations\Symfony\V4_4\AutomatedLoginEventsTest — 13.9s (+13.05s, +1524%)  

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

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