[ML] Change CustomService to leverage newer default chunking settings if not specified in request #135726
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This PR is a manual backport of a bug I found with adding tests in this PR: https://github.com/elastic/elasticsearch/pull/135461/files#diff-4629b6ec66d009a36e0568099ed1195ab4605a075c43c38a57bfb1ea06955d51R110
Prior to this fix, if the chunking settings were not specified, the older default settings would be applied. After this PR, the newer chunking settings default will be used if they weren't specified in the PUT request for a CustomService.