[chore] Prepare release v1.9.0/v0.102.0 (#10293)

The following commands were run to prepare this release:
- make chlog-update VERSION=v1.9.0/v0.102.0
- make prepare-release PREVIOUS_VERSION=1.8.0 RELEASE_CANDIDATE=1.9.0
MODSET=stable
- make prepare-release PREVIOUS_VERSION=0.101.0
RELEASE_CANDIDATE=0.102.0 MODSET=beta

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Co-authored-by: Pablo Baeyens <[email protected]>

Author: opentelemetrybot