refactor(integration-test): modernize ts tests, update versions, rename SSE -> HTTP (#618)

- add tsconfig
- fix tsignore
- rename sse -> http
- clean up code

## How Has This Been Tested?
all tests passed

## Breaking Changes
none

## Types of changes
- [x] 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)
- [ ] Documentation update

## Checklist
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [x] I have added appropriate error handling
- [x] I have added or updated documentation as needed

test-utils/src/jvmMain/kotlin/io/modelcontextprotocol/kotlin/test/utils/testing.kt

@@ -8,7 +8,6 @@ import kotlin.coroutines.CoroutineContext
 import kotlin.time.Duration
 import kotlin.time.Duration.Companion.seconds
 
-@Suppress("InjectDispatcher") // this is constant
 private val defaultTestDispatcher: CoroutineContext = Dispatchers.IO.limitedParallelism(100)
 private val defaultTestTimeout: Duration = 5.seconds