test: Add IT for large shard test suite (#1737)

Fixes #1650

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

New IT succeed.

## Checklist

- [x] Integration tests updated

integration_tests/src/test/kotlin/integration/ManyTestsOnSingleShardIT.kt

@@ -0,0 +1,59 @@
+package integration
+
+import FlankCommand
+import com.google.common.truth.Truth.assertThat
+import org.junit.Test
+import run
+import utils.CONFIGS_PATH
+import utils.FLANK_JAR_PATH
+import utils.androidRunCommands
+import utils.asOutputReport
+import utils.assertCostMatches
+import utils.assertCountOfFailedTests
+import utils.assertCountOfSkippedTests
+import utils.assertExitCode
+import utils.assertTestCountMatches
+import utils.findTestDirectoryFromOutput
+import utils.firstTestSuiteOverview
+import utils.json
+import utils.loadAsTestSuite
+import utils.removeUnicode
+import utils.toJUnitXmlFile
+import utils.toOutputReportFile
+
+class ManyTestsOnSingleShardIT {
+
+    private val name = this::class.java.simpleName
+
+    @Test
+    fun `return with exit code 0 and has correct output`() {
+        val result = FlankCommand(
+            flankPath = FLANK_JAR_PATH,
+            ymlPath = "$CONFIGS_PATH/flank_android_many_tests_on_single_shard.yml",
+            params = androidRunCommands
+        ).run("./", name)
+        val expectedTestCount = 60
+
+        assertExitCode(result, 0)
+
+        val resOutput = result.output.removeUnicode()
+        val outputDirectory = resOutput.findTestDirectoryFromOutput()
+
+        // validate JUnitReport.xml
+        val testSuites = outputDirectory.toJUnitXmlFile().loadAsTestSuite()
+        assertThat(testSuites.testSuites.first().testCases.size).isEqualTo(expectedTestCount)
+        (0 until expectedTestCount).forEach { testNumber ->
+            assertThat(testSuites.testSuites.any { it.name == "test$testNumber" })
+            assertThat(testSuites.assertCountOfFailedTests(0))
+            assertThat(testSuites.assertCountOfSkippedTests(0))
+        }
+
+        // validate general
+        val outputReport = outputDirectory.toOutputReportFile().json().asOutputReport()
+        outputReport.assertCostMatches()
+        assertThat(outputReport.testResults).isNotEmpty()
+        assertThat(outputReport.weblinks).isNotEmpty()
+        assertThat(outputReport.error).isEmpty()
+        outputReport.firstTestSuiteOverview.assertTestCountMatches(total = expectedTestCount)
+    }
+}

integration_tests/src/test/resources/cases/flank_android_many_tests_on_single_shard.yml

@@ -0,0 +1,9 @@
+gcloud:
+  app: ../test_runner/src/test/kotlin/ftl/fixtures/tmp/apk/app_many_tests-debug.apk
+  test: ../test_runner/src/test/kotlin/ftl/fixtures/tmp/apk/app_many_tests-debug-androidTest.apk
+
+flank:
+  disable-sharding: true
+  disable-results-upload: true
+  disable-usage-statistics: true
+  output-report: json