HttpClient fails to connect https target through http proxy with authentication when client's `strictEventOrdering` is set to true

**Jetty version(s)**
9.4.40.v20210413 (also 11.0.12)

**Java version/vendor** `(use: java -version)`
openjdk 17.0.4 2022-07-19

**OS type/version**
macOS 12.6

**Description**
I tried to access a https target trough HTTP squid proxy but it keeps failing with `Pipelined requests not supported` exception ([jetty-client-stacktrace.log](https://github.com/eclipse/jetty.project/files/9799183/jetty-client-stacktrace.log)). However if the `strictEventOrdering` is set to false connection is successful and target is loaded. Also if I'm connecting to http target (http://www.google.com) this will not happen.

With a small investigation it seems like when the `HttpReceiver.terminateResponse` notifies complete and by the time `HttpChannel.associate` getting called `disassociate` hasn't been executed resulting `ProxyConnection` which is used (which is getting configured to request attribute in `HttpProxy.tunnel` and used in `AuthenticationListener.onComplete`) will still have previous non null `_exchange`.

**How to reproduce?**
``` java
@Test
public void testProxyWithAuth() throws Exception {
String user = "test";
String password = "test";
String serverHost = "https://www.google.com";
String realm = "Squid proxy-realm";
String proxyHost = "127.0.0.1";
int proxyPort = 8080;

SslContextFactory.Client sslContextFactory = new SslContextFactory.Client();
sslContextFactory.setTrustAll(true);

HttpClient client = new HttpClient(sslContextFactory);

ProxyConfiguration proxyConfig = client.getProxyConfiguration();
HttpProxy proxy = new HttpProxy(new Origin.Address(proxyHost, proxyPort), false);
proxy.getIncludedAddresses().add("www.google.com:80");
proxy.getIncludedAddresses().add("www.google.com:443");

client.getAuthenticationStore().addAuthentication(
new BasicAuthentication(new URI("http://" + proxyHost + ":" + proxyPort)
, realm, user, password)
);

proxyConfig.getProxies().add(proxy);

client.setExecutor(new QueuedThreadPool(64, 0, 60000));
client.setMaxConnectionsPerDestination(10);
client.setIdleTimeout(6000);
client.setStrictEventOrdering(true);
client.setFollowRedirects(true);

client.start();

try {
Request request = client.newRequest(serverHost);
ContentResponse response = request
.timeout(600, TimeUnit.SECONDS)
.send();

System.out.println("Status: " + response.getStatus());
} finally {
client.stop();
}
}
```