Remove Flaky annotation on tests expected to work

[phd3]

#4864 seems like a duplicate of #5201.

[hashhar]

You can stress-test this like https://github.com/trinodb/trino/pull/7593/files#diff-b803fcb7f17ed9235f1e5cb1fcd2f5d3b2838429d4368ae4c57ce4436577f03fR26-R28 to make sure it's not Flaky anymore.

[findepi]

Assuming this is just a left over after a244d3d, it may not need stress testing.

@hashhar wdyt?

[hashhar]

The beginning of the stack-trace look different between #4864 and #5201 so I'm not 100% sure the cause is same but it could be the same.

[phd3]

#4864 shows an additional warning given by iceberg finalizer code that contains the stacktrace to indicate the codepath that creates streams that weren't explicitly closed. I've also seen the same while debugging #5201, but somehow not added on the issue. I think it should be safe to get this in, since #8504 was stress-tested.

[findepi]

@hashhar thumbed up, so merging.