Make a single scrape attempt, protected by Awaitility

Using a single scrape attempt that is protected by Awaitility should
protect against instability of the OpenTelemetry Collector instance
running in the container and will hopefully stabilize the test.

This commit has also increased the timeout for a successful response
to 30 seconds and removed the configuration of the configuration of
the polling delay and interval as the values being set were the same
as the defaults.

Closes gh-42377

Author: wilkinsona

spring-boot-project/spring-boot-testcontainers/src/dockerTest/java/org/springframework/boot/testcontainers/service/connection/otlp/OpenTelemetryMetricsContainerConnectionDetailsFactoryIntegrationTests.java

@@ -80,24 +80,20 @@ void connectionCanBeMadeToOpenTelemetryCollectorContainer() {
 		Timer.builder("test.timer").register(this.meterRegistry).record(Duration.ofMillis(123));
 		DistributionSummary.builder("test.distributionsummary").register(this.meterRegistry).record(24);
 		Awaitility.await()
-			.atMost(Duration.ofSeconds(5))
-			.pollDelay(Duration.ofMillis(100))
-			.pollInterval(Duration.ofMillis(100))
+			.atMost(Duration.ofSeconds(30))
 			.untilAsserted(() -> whenPrometheusScraped().then()
 				.statusCode(200)
 				.contentType(OPENMETRICS_001)
-				.body(endsWith("# EOF\n"), containsString("service_name")));
-		whenPrometheusScraped().then()
-			.body(containsString(
-					"{job=\"test\",service_name=\"test\",telemetry_sdk_language=\"java\",telemetry_sdk_name=\"io.micrometer\""),
-					matchesPattern("(?s)^.*test_counter\\{.+} 42\\.0\\n.*$"),
-					matchesPattern("(?s)^.*test_gauge\\{.+} 12\\.0\\n.*$"),
-					matchesPattern("(?s)^.*test_timer_count\\{.+} 1\\n.*$"),
-					matchesPattern("(?s)^.*test_timer_sum\\{.+} 123\\.0\\n.*$"),
-					matchesPattern("(?s)^.*test_timer_bucket\\{.+,le=\"\\+Inf\"} 1\\n.*$"),
-					matchesPattern("(?s)^.*test_distributionsummary_count\\{.+} 1\\n.*$"),
-					matchesPattern("(?s)^.*test_distributionsummary_sum\\{.+} 24\\.0\\n.*$"),
-					matchesPattern("(?s)^.*test_distributionsummary_bucket\\{.+,le=\"\\+Inf\"} 1\\n.*$"));
+				.body(endsWith("# EOF\n"), containsString(
+						"{job=\"test\",service_name=\"test\",telemetry_sdk_language=\"java\",telemetry_sdk_name=\"io.micrometer\""),
+						matchesPattern("(?s)^.*test_counter\\{.+} 42\\.0\\n.*$"),
+						matchesPattern("(?s)^.*test_gauge\\{.+} 12\\.0\\n.*$"),
+						matchesPattern("(?s)^.*test_timer_count\\{.+} 1\\n.*$"),
+						matchesPattern("(?s)^.*test_timer_sum\\{.+} 123\\.0\\n.*$"),
+						matchesPattern("(?s)^.*test_timer_bucket\\{.+,le=\"\\+Inf\"} 1\\n.*$"),
+						matchesPattern("(?s)^.*test_distributionsummary_count\\{.+} 1\\n.*$"),
+						matchesPattern("(?s)^.*test_distributionsummary_sum\\{.+} 24\\.0\\n.*$"),
+						matchesPattern("(?s)^.*test_distributionsummary_bucket\\{.+,le=\"\\+Inf\"} 1\\n.*$")));
 	}
 
 	private Response whenPrometheusScraped() {