Add retries for pulling snapshot info in overhead tests

[jaydeluca]

Related to #14356

Adding in some extended timeouts and retries to try and make the overhead benchmark test setup more resilient. Adding this in allowed me to successfully run these locally.

I can reproduce the flakyness of the sonatype site by trying to access https://oss.sonatype.org/content/repositories/snapshots/io/opentelemetry/javaagent/opentelemetry-javaagent/maven-metadata.xml and seeing sporadic 502 gateway timeouts.

Here is the stack trace from when running it locally before applying the fix:

org.opentest4j.AssertionFailedError: Unhandled exception in release
	at app//org.junit.jupiter.api.AssertionUtils.fail(AssertionUtils.java:42)
	at app//org.junit.jupiter.api.Assertions.fail(Assertions.java:150)
	at app//io.opentelemetry.OverheadTests.lambda$runTestConfig$2(OverheadTests.java:73)
	at [email protected]/java.util.ArrayList.forEach(ArrayList.java:1596)
	at [email protected]/java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1116)
	at app//io.opentelemetry.OverheadTests.runTestConfig(OverheadTests.java:68)
	at app//io.opentelemetry.OverheadTests.lambda$runAllTestConfigurations$0(OverheadTests.java:61)
	at [email protected]/java.util.Optional.ifPresent(Optional.java:178)
	at [email protected]/java.util.ArrayList.forEach(ArrayList.java:1596)
	at [email protected]/java.util.ArrayList.forEach(ArrayList.java:1596)
Caused by: java.net.SocketTimeoutException: timeout
	at okhttp3.internal.http2.Http2Stream$StreamTimeout.newTimeoutException(Http2Stream.kt:731)
	at okhttp3.internal.http2.Http2Stream$StreamTimeout.exitAndThrowIfTimedOut(Http2Stream.kt:739)
	at okhttp3.internal.http2.Http2Stream.takeHeaders(Http2Stream.kt:159)
	at okhttp3.internal.http2.Http2ExchangeCodec.readResponseHeaders(Http2ExchangeCodec.kt:101)
	at okhttp3.internal.connection.Exchange.readResponseHeaders(Exchange.kt:114)
	at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.kt:98)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
	at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.kt:34)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
	at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.kt:101)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
	at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.kt:85)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
	at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:74)
	at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:126)
	at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(RealCall.kt:208)
	at okhttp3.internal.connection.RealCall.execute(RealCall.kt:160)
	at io.opentelemetry.agents.LatestAgentSnapshotResolver.fetchBodyFrom(LatestAgentSnapshotResolver.java:87)
	at io.opentelemetry.agents.LatestAgentSnapshotResolver.fetchBodyStringFrom(LatestAgentSnapshotResolver.java:77)
	at io.opentelemetry.agents.LatestAgentSnapshotResolver.fetchLatestSnapshotVersion(LatestAgentSnapshotResolver.java:70)
	at io.opentelemetry.agents.LatestAgentSnapshotResolver.resolve(LatestAgentSnapshotResolver.java:34)
	at io.opentelemetry.agents.AgentResolver.resolve(AgentResolver.java:28)
	at io.opentelemetry.containers.PetClinicRestContainer.build(PetClinicRestContainer.java:48)
	at io.opentelemetry.OverheadTests.runAppOnce(OverheadTests.java:86)
	at io.opentelemetry.OverheadTests.lambda$runTestConfig$2(OverheadTests.java:71)
	... 7 more

[trask]

another good option might be to build and use the javaagent from latest checkout, ./gradew :javaagent:assemble

cc @breedx-splk in case he remembers any reasons behind current strategy