Backport of recent fixes to backend/etcdv3 #29203
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The current usage of internal remote state backends requires that `StateMgr` be able to return an instance of `statemgr.Full` even if the state is currently locked.
etcd rewrote its import path from coreos/etcd to go.etcd.io/etcd. Changed the imports path in this commit, which also updates the code version. This lets us remove the github.com/ugorji/go/codec dependency, which was pinned to a fairly old version. The net change is a loss of 30,000 lines of code in the vendor directory. (I first noticed this problem because the outdated go/codec dependency was causing a dependency failure when I tried to put Terraform and another project in the same vendor directory.) Note the version shows up funkily in go.mod, but I verified visually it's the same commit as the "release-3.4" tag in github.com/coreos/etcd. The etcd team plans to fix the release version tagging in v3.5, which should be released soon.
The etcdv3 client has a default request send limit of 2.0 MiB. This change exposes the configuration option to increase that limit enabling larger state using the etcdv3 backend. This also requires that the corresponding --max-request-bytes flag be increased on the server side. The default there is 1.5 MiB. Fixes #25745
Fix website-link-check failing as https://coreos.com/etcd/ 301's to https://etcd.io/. Updated link to https://etcd.io/.
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Backport of commits from #28128, #25554, and #28078.