backend/s3: Adds parameter skip_s3_checksum to skip checksum on upload

[gdavison]

Some "S3-compatible" APIs do not support the header x-amz-sdk-checksum-algorithm. In the S3 API, a checksum is recommended and is required when Object Lock is enabled.

Allow users to disable the header.

Fixes #34099
Fixes #34086
Relates #34053 (comment)

Target Release

1.6.3

Draft CHANGELOG entry

ENHANCEMENTS

• backend/s3: Allows users to disable checksum on S3 uploads for compatibility with "S3-compatible" APIs

[jar-b]

LGTM 🎉

% TF_ACC=1 go test -count=1 ./internal/backend/remote-state/s3/...
ok      github.com/hashicorp/terraform/internal/backend/remote-state/s3 144.245s

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[kamenskiyyyy]

@gdavison Hi! When will terraform 1.6.3 release be published?

[crw]

@kamenskiyyyy It is variable, but in the normal state of events it would be available in the middle of next week. This can change depending on variety of factors.

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.