revert(codecs): fix protobuf codecs supported data types (#23610)

* Revert "chore(codecs protobuf): allow all telemetry types (#23550)"

This reverts commit f9d2800d873d2e5a15b1920ad49c7e357702a890.

* add known issue

* encoder supports traces too

* Update website/cue/reference/releases/0.49.0.cue

Co-authored-by: Rosa Trieu <107086888+rtrieu@users.noreply.github.com>

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Co-authored-by: Rosa Trieu <107086888+rtrieu@users.noreply.github.com>