fix: JUnitReport.xml only contained 50 test results (#1649)

Fixes #1634

## Test Plan
> How do we know the code works?

Existing tests should not be broken

## Checklist

- [x] Documented
- [x] Unit tested
- [x] Integration tests updated

test_runner/src/main/kotlin/ftl/gc/GcToolResults.kt

@@ -8,6 +8,7 @@ import com.google.api.services.toolresults.model.ListEnvironmentsResponse
 import com.google.api.services.toolresults.model.ListStepsResponse
 import com.google.api.services.toolresults.model.ListTestCasesResponse
 import com.google.api.services.toolresults.model.Step
+import com.google.api.services.toolresults.model.TestCase
 import com.google.testing.model.TestExecution
 import com.google.testing.model.ToolResultsExecution
 import com.google.testing.model.ToolResultsHistory
@@ -123,7 +124,10 @@ object GcToolResults {
         .executeWithRetry()
 
     // Lists Test Cases attached to a Step
-    fun listTestCases(toolResultsStep: ToolResultsStep): ListTestCasesResponse {
+    fun listTestCases(
+        toolResultsStep: ToolResultsStep,
+        pageToken: String? = null
+    ): ListTestCasesResponse {
         return service
             .projects()
             .histories()
@@ -135,7 +139,19 @@ object GcToolResults {
                 toolResultsStep.historyId,
                 toolResultsStep.executionId,
                 toolResultsStep.stepId
-            ).executeWithRetry()
+            )
+            .setPageToken(pageToken)
+            .executeWithRetry()
+    }
+
+    fun listAllTestCases(results: ToolResultsStep): List<TestCase> {
+        var response = listTestCases(results)
+        val testCases = response.testCases.toMutableList()
+        while (response.nextPageToken != null) {
+            response = listTestCases(results, response.nextPageToken)
+            testCases += response.testCases ?: emptyList()
+        }
+        return testCases
     }
 
     fun getDefaultBucket(projectId: String, source: String? = null): String? = try {

test_runner/src/main/kotlin/ftl/reports/api/CreateTestExecutionData.kt

@@ -1,6 +1,5 @@
 package ftl.reports.api
 
-import com.google.api.services.toolresults.model.ListTestCasesResponse
 import com.google.api.services.toolresults.model.Step
 import com.google.api.services.toolresults.model.TestCase
 import com.google.api.services.toolresults.model.Timestamp
@@ -26,12 +25,10 @@ internal fun List<TestExecution>.createTestExecutionDataListAsync(): List<TestEx
 
 private suspend fun TestExecution.createTestExecutionData(): TestExecutionData {
     val (
-        response: ListTestCasesResponse,
+        testCases: List<TestCase>,
         step: Step
     ) = getAsync(toolResultsStep)
 
-    val testCases = response.testCases ?: emptyList()
-
     return TestExecutionData(
         testExecution = this@createTestExecutionData,
         testCases = testCases,
@@ -41,7 +38,7 @@ private suspend fun TestExecution.createTestExecutionData(): TestExecutionData {
 }
 
 private suspend fun getAsync(toolResultsStep: ToolResultsStep) = coroutineScope {
-    val response = async { GcToolResults.listTestCases(toolResultsStep) }
+    val response = async { GcToolResults.listAllTestCases(toolResultsStep) }
     val step = async { GcToolResults.getStepResult(toolResultsStep) }
     response.await() to step.await()
 }

test_runner/src/test/kotlin/ftl/reports/api/CreateTestExecutionDataKtTest.kt

@@ -67,7 +67,7 @@ class CreateTestExecutionDataKtTest {
     fun `should not throw is ListTestCasesResponse testCases are null`() {
         // given
         every { GcToolResults.getStepResult(any()) } returns Step()
-        every { GcToolResults.listTestCases(any()) } returns ListTestCasesResponse()
+        every { GcToolResults.listAllTestCases(any()) } returns emptyList()
 
         val testExecution = TestExecution().apply {
             toolResultsStep = ToolResultsStep()