[V4] Preview 6

[dscpinheiro]

Description

This PR prepares the SDK for the next preview of V4. The relevant commits are:

• Merge commit: 728449c
• Update to generated files: e43298a
  • Note: There are a lot of files here since the System.Text.Json changes impact marshallers for all services that use the JSON protocol. It may be necessary to checkout the branch locally.
• Remove obsolete methods for S3 data integrity changes: 20f97ce
• Update to versioning files: 37eaf48
• Fix for DynamoDB tests: 02dd0dd
  • Related to: Fix TransactWrite<T>.AddSaveItem when T does NOT contain DynamoDbProperty Attributes #3614 (since we now perform a Put operation instead of an Update)

Testing

• Dry-run: DRY_RUN-be1b5346-2dbc-43fe-bde6-8b998ad31367

License

• I confirm that this pull request can be released under the Apache 2 license

[dscpinheiro]

One difference in the generated files is RegionEndpoint.generated.cs: In V3, we use the endpoints.json file so the new regions in the aws-iso-f partition are already available:

aws-sdk-net/sdk/src/Core/RegionEndpoint/RegionEndpoint.generated.cs

Lines 235 to 243 in 6578451

	/// <summary>
	/// The US ISOF EAST endpoint.
	/// </summary>
	public static readonly RegionEndpoint USIsofEast1 = GetEndpoint("us-isof-east-1", "US ISOF EAST");
	/// <summary>
	/// The US ISOF SOUTH endpoint.
	/// </summary>
	public static readonly RegionEndpoint USIsofSouth1 = GetEndpoint("us-isof-south-1", "US ISOF SOUTH");

In V4, since we rely on partitions.json instead - and this file hasn't been updated yet - the regions are not available. I believe that's OK for now since customers can still use RegionEndpoint.GetBySystemName("us-isof-east-1") and the SDK will work as expected (and of course, when the partitions file is updated V4 will pick up the changes).

[peterrsongg]

Checked out the branch locally. Verified the stj changes were there. Also, the versioning looks good on the extensions packages.