RUM-5579 chore: Rename IntegrationTests project to UITests

[ncreated]

What and why?

📦 This PR renames the IntegrationTests project to UITests.

There are multiple motivations:

• Remove confusion – We already have IntegrationUnitTests, which serves as our integration test target.
• Reflect actual usage – In discussions, we keep referring to these as "UI Tests".
• Maintains naming consistency – The new name aligns with other test categories in the repository root: SmokeTests, UITests, E2ETests, BenchmarkTests.

With this change, we can use clear, unambiguous test classifications:

• Unit Tests
• Integration Tests
• UI Tests
• Smoke Tests
• Benchmark Tests
• E2E Tests

How?

This change is purely a renaming of folders, configurations, and some files.

Notably, part of this work was already done during the GitLab migration project, where we introduced ui-test naming in Makefile commands:

make ui-test  
make ui-test-all  
make ui-test-podinstall  

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
• Add Objective-C interface for public APIs (see our guidelines [internal]) and run make api-surface)

[simaoseica-dd]

🧹 🧹

[simaoseica-dd]

Maybe these BuildableName and BlueprintName should be renamed as well

[simaoseica-dd]

UITestsScenarios?