misc: Make event loop THE implementation for httpRemoteTask and related code (#26697)

## Description

1. event loop based http remote task, task status fetcher and task info
fetcher has been reliably running in production for many months now.
This pr makes event loop as the default implementation for those three
classes and remove the old code.
2. I also tried to replay production queries with only 5 threads for the
event loop attempting to catch any potential issues but no issue has
been found.
3. heapdump analysis also showed that the failTask call is heavy
containing a recursive toFailure call. This is something we can
optimize.


## Motivation and Context
clean up the duplicate code back then for roll out purpose.


## Impact
<!---Describe any public API or user-facing feature change or any
performance impact-->

## Test Plan
1. passed verifiers

## Contributor checklist

- [ ] Please make sure your submission complies with our [contributing
guide](https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md),
in particular [code
style](https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md#code-style)
and [commit
standards](https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md#commit-standards).
- [ ] PR description addresses the issue accurately and concisely. If
the change is non-trivial, a GitHub Issue is referenced.
- [ ] Documented new properties (with its default value), SQL syntax,
functions, or other functionality.
- [ ] If release notes are required, they follow the [release notes
guidelines](https://github.com/prestodb/presto/wiki/Release-Notes-Guidelines).
- [ ] Adequate tests were added if applicable.
- [ ] CI passed.
- [ ] If adding new dependencies, verified they have an [OpenSSF
Scorecard](https://securityscorecards.dev/#the-checks) score of 5.0 or
higher (or obtained explicit TSC approval for lower scores).

## Release Notes

```
== NO RELEASE NOTE ==
```

Author: shangm2

presto-main-base/src/main/java/com/facebook/presto/execution/TaskManagerConfig.java

@@ -99,7 +99,6 @@ public class TaskManagerConfig
     private double highMemoryTaskKillerGCReclaimMemoryThreshold = 0.01;
     private Duration highMemoryTaskKillerFrequentFullGCDurationThreshold = new Duration(1, SECONDS);
     private double highMemoryTaskKillerHeapMemoryThreshold = 0.9;
-    private boolean enableEventLoop = true;
     private Duration slowMethodThresholdOnEventLoop = new Duration(0, SECONDS);
 
     public long getSlowMethodThresholdOnEventLoop()
@@ -114,18 +113,6 @@ public TaskManagerConfig setSlowMethodThresholdOnEventLoop(Duration slowMethodTh
         return this;
     }
 
-    @Config("task.enable-event-loop")
-    public TaskManagerConfig setEventLoopEnabled(boolean enableEventLoop)
-    {
-        this.enableEventLoop = enableEventLoop;
-        return this;
-    }
-
-    public boolean isEventLoopEnabled()
-    {
-        return enableEventLoop;
-    }
-
     @MinDuration("1ms")
     @MaxDuration("10s")
     @NotNull

presto-main-base/src/test/java/com/facebook/presto/execution/TestTaskManagerConfig.java

@@ -80,8 +80,7 @@ public void testDefaults()
                 .setHighMemoryTaskKillerFrequentFullGCDurationThreshold(new Duration(1, SECONDS))
                 .setHighMemoryTaskKillerHeapMemoryThreshold(0.9)
                 .setTaskUpdateSizeTrackingEnabled(true)
-                .setSlowMethodThresholdOnEventLoop(new Duration(0, SECONDS))
-                .setEventLoopEnabled(true));
+                .setSlowMethodThresholdOnEventLoop(new Duration(0, SECONDS)));
     }
 
     @Test
@@ -130,7 +129,6 @@ public void testExplicitPropertyMappings()
                 .put("experimental.task.high-memory-task-killer-frequent-full-gc-duration-threshold", "2s")
                 .put("experimental.task.high-memory-task-killer-heap-memory-threshold", "0.8")
                 .put("task.update-size-tracking-enabled", "false")
-                .put("task.enable-event-loop", "false")
                 .put("task.event-loop-slow-method-threshold", "10m")
                 .build();
 
@@ -177,7 +175,6 @@ public void testExplicitPropertyMappings()
                 .setHighMemoryTaskKillerFrequentFullGCDurationThreshold(new Duration(2, SECONDS))
                 .setHighMemoryTaskKillerHeapMemoryThreshold(0.8)
                 .setTaskUpdateSizeTrackingEnabled(false)
-                .setEventLoopEnabled(false)
                 .setSlowMethodThresholdOnEventLoop(new Duration(10, MINUTES));
 
         assertFullMapping(properties, expected);