[SPARK-51061][CORE] Hide Jetty info in REST Submission API

[dongjoon-hyun]

What changes were proposed in this pull request?

This PR aims to hide Jetty info in REST Submission API like SPARK-46239.

• [SPARK-46239][CORE] Hide Jetty info #44158

Why are the changes needed?

Start Spark Master server.

$ SPARK_MASTER_OPTS='-Dspark.master.rest.enabled=true' sbin/start-master.sh

BEFORE:

$ curl -vv http://0.0.0.0:6066/v1/submissions/readyz
*   Trying 0.0.0.0:6066...
* Connected to 0.0.0.0 (0.0.0.0) port 6066
> GET /v1/submissions/readyz HTTP/1.1
> Host: 0.0.0.0:6066
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< Date: Sun, 02 Feb 2025 05:14:04 GMT
< Content-Type: application/json;charset=utf-8
< Content-Length: 114
< Server: Jetty(11.0.24)
<
{
  "action" : "ReadyzResponse",
  "message" : "",
  "serverSparkVersion" : "4.1.0-SNAPSHOT",
  "success" : true
* Connection #0 to host 0.0.0.0 left intact
}

AFTER

$ curl -vv http://0.0.0.0:6066/v1/submissions/readyz
*   Trying 0.0.0.0:6066...
* Connected to 0.0.0.0 (0.0.0.0) port 6066
> GET /v1/submissions/readyz HTTP/1.1
> Host: 0.0.0.0:6066
> User-Agent: curl/8.7.1
> Accept: */*
>
* Request completely sent off
< HTTP/1.1 200 OK
< Date: Sun, 02 Feb 2025 05:12:41 GMT
< Content-Type: application/json;charset=utf-8
< Content-Length: 114
<
{
  "action" : "ReadyzResponse",
  "message" : "",
  "serverSparkVersion" : "4.1.0-SNAPSHOT",
  "success" : true
* Connection #0 to host 0.0.0.0 left intact
}

Does this PR introduce any user-facing change?

No, there is no technical behavior change because this is a meta-data.

How was this patch tested?

Manual test with the above procedure.

Was this patch authored or co-authored using generative AI tooling?

No.