[2.0] [s3] Change default for preserve_data_ordering to On

[PettitWesley]

Currently this field defaults to Off: https://docs.fluentbit.io/manual/pipeline/outputs/s3

However, realistically, most S3 users should want to use that setting. There's little real downside to it, it won't realistically impact performance, since S3 will now all be on sync IO with my recent bug fix (fluent/fluent-bit#6573).

2.0 is an opportunity to "break" backwards compatibility in small ways. While upstream already has 2.0 out, this distro has not released it yet (which will be our 3.0).

Our first release should include changing the default to on for Preserve_Data_Ordering

*If you have any comments or concerns on this plan, please note them in this issue.` This distro is still testing Fluent Bit 2.0 and so we will not release it until next year.

[PettitWesley]

fluent/fluent-bit#6617

[dshackith]

If this issue is not fixed, setting this to default on will cause problems.

[PettitWesley]

@dshackith Can you please open an issue on the AWS repo for this. https://github.com/aws/aws-for-fluent-bit

The preserve_data_ordering feature doesn't impact the S3 code path IIRC, so the behavior shouldn't change due to that.

[dshackith]

Opened #541