b/fix_dms_task_update_bug_19938: Add required fields to update input

[Phlair]

Description

This PR intends to fix the bug described here by including MigrationType and TableMappings on the update call regardless of whether they have been changed. That issue is well written and is great for context.

Relations

Closes #19938

References

Readme in this repo for dms - note: the altered fields are listed as required. AWS dms api

Output from Acceptance Testing

I couldn't acceptance test this, hopefully you can run this on your side. I would be surprised if this change caused failures but you never know...

[github-actions[bot]]

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[github-actions[bot]]

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