fix: Remove flaky assertion due to upload at init

[maxep]

What and why?

The upload at init could pick files in the authorized folder, so we cannot guarantee that the files will be there while running the test.

The assertion can be removed as we only need to assert that the clearAllData removes all files.

Review checklist

• Feature or bugfix MUST have appropriate tests (unit, integration)
• Make sure each commit and the PR mention the Issue number or JIRA reference
• Add CHANGELOG entry for user facing changes

Custom CI job configuration (optional)

• Run unit tests for Core, RUM, Trace, Logs, CR and WVT
• Run unit tests for Session Replay
• Run integration tests
• Run smoke tests
• Run tests for tools/

[ncreated]

Looks good 👍

Mentioning #1798 for GH link reference.

[datadog-datadog-prod-us1]

Datadog Report

Branch report: maxep/fix-flakiness
Commit report: c158008
Test service: dd-sdk-ios

✅ 0 Failed, 2843 Passed, 0 Skipped, 2m 22.54s Total Time
🔻 Test Sessions change in coverage: 9 decreased, 3 increased, 1 no change

🔻 Code Coverage Decreases vs Default Branch (9)

This report shows up to 5 code coverage decreases.

• test DatadogCoreTests tvOS 78.81% (-0.81%) - Details
• test DatadogLogsTests tvOS 45.06% (-0.32%) - Details
• test DatadogLogsTests iOS 45% (-0.32%) - Details
• test DatadogCoreTests iOS 73.27% (-0.22%) - Details
• test DatadogRUMTests tvOS 80.81% (-0.22%) - Details