Disable existence checks in S3OutputFile.create

Restore the behavior before as it was before support for conditional
writes was introduced.  File existence checks are not implemented for
multi-part upload code path (the `FileAlreadyExistsException` is throw
only when multi-part did not take place). Furthermore, file existence
checks can break file writes when the call is retried on the AWS SDK
level. Fixing both these issues is possible, but not necessary: users of
`TrinoOutputFile.create` cannot assume particular behavior and file
system implementation is allowed to overwrite existing files.

Atomic writes are necessary for Delta's connector transaction log
synchronizer `S3ConditionalWriteLogSynchronizer`, but is explicitly
invokes `TrinoOutputFile.createExclusive` API.

Author: findepi

lib/trino-filesystem-s3/src/main/java/io/trino/filesystem/s3/S3OutputFile.java

@@ -71,7 +71,7 @@ public void createExclusive(byte[] data)
     @Override
     public OutputStream create(AggregatedMemoryContext memoryContext)
     {
-        return create(memoryContext, context.exclusiveWriteSupported());
+        return create(memoryContext, false);
     }
 
     private OutputStream create(AggregatedMemoryContext memoryContext, boolean exclusive)

lib/trino-filesystem-s3/src/test/java/io/trino/filesystem/s3/AbstractTestS3FileSystem.java

@@ -94,6 +94,12 @@ protected final Location getRootLocation()
         return Location.of("s3://%s/".formatted(bucket()));
     }
 
+    @Override
+    protected boolean isCreateExclusive()
+    {
+        return false;
+    }
+
     @Override
     protected final boolean supportsRenameFile()
     {

lib/trino-filesystem-s3/src/test/java/io/trino/filesystem/s3/TestS3FileSystemS3Mock.java

@@ -38,12 +38,6 @@ public class TestS3FileSystemS3Mock
     private static final S3MockContainer S3_MOCK = new S3MockContainer("3.0.1")
             .withInitialBuckets(BUCKET);
 
-    @Override
-    protected boolean isCreateExclusive()
-    {
-        return false; // not supported by s3-mock
-    }
-
     @Override
     protected boolean supportsCreateExclusive()
     {