AWS: Make sure overridden configurations are applied

[hsiang-c]

Context

• In the iceberg-aws module, the community has added the following S3 configurations over time:

S3 configuration	Pull Request
Signer configuration	#7562
UserAgent configuration	#9963
Retry configuration	#11052

• As PR AWS: Make sure Signer + User Agent config are both applied #10198 suggested, calling builder.overrideConfiguration() will return a new ClientOverrideConfiguration instance and ignore existing overridden configurations.
• However, the previous PR didn't take care of the Retry configuration b/c it was introduced only a few days ago.

Proposed changes

• Make sure we can apply the following configurations without losing conf values.

s3Properties.applySignerConfiguration(builder);
s3Properties.applyUserAgentConfigurations(builder);
s3Properties.applyRetryConfigurations(builder);

[hsiang-c]

@ookumuso @nastra Please review the fix when you have time, thanks.

[nastra]

LGTM, thanks for catching and fixing this @hsiang-c

[hsiang-c]

Thank you for your review @nastra