Remove type parameters from Client.prepareDelete() and Client.prepareUpdate()

[romseygeek]

Type parameters are no longer used in DeleteRequest or UpdateRequest; this commit
removes them from the prepareX methods on Client, as well as removing setType()
and deprecated constructors on XRequestBuilder objects.

Relates to #41059

[elasticmachine]

Pinging @elastic/es-distributed (:Distributed/CRUD)

[romseygeek]

@elasticmachine run elasticsearch-ci/packaging-sample

[romseygeek]

@elasticmachine update branch

[jtibshirani]

@romseygeek to check I understand the change -- in addition to removing typed versions of prepareUpdate and prepareDelete, the PR removes prepareIndex(index, type). But prepareIndex(index, type, id) is still present and will be removed in a future PR?

[romseygeek]

I had intended to remove prepareIndex(index, type) in a separate PR but rebased against the wrong branch apparently. I can separate the two changes out if that makes it easier to review?

[romseygeek]

@elasticmachine update branch

[romseygeek]

@elasticmachine update branch

[jtibshirani]

I had intended to remove prepareIndex(index, type) in a separate PR but rebased against the wrong branch apparently. I can separate the two changes out if that makes it easier to review?

If it's not a ton of work, I think that would be cleanest. But if it will take significant time, we could just update the PR description to clearly list out what has changed, and mention the plan for a follow-up PR?

[jtibshirani]

@romseygeek and I discussed offline -- we will keep the change as-is because would be a large amount of work to separate it out.

[jtibshirani]

This looks good to me.

[romseygeek]

@elasticmachine update branch