[chore] Release-v0.147.0-changelog (#7297)

* Changelog as generated by make prepare-changelog

* Removing non-applicable entries

* Remove entry for exporter/signalfx that was already cherry-picked

Co-authored-by: Curtis Robert <crobert@splunk.com>

* Remove pkg/translator/pprof

Co-authored-by: Curtis Robert <crobert@splunk.com>

* Remove entries for extension/memory_limiter

Co-authored-by: Curtis Robert <crobert@splunk.com>

* Remove pkg/translator/pprof entry

Co-authored-by: Curtis Robert <crobert@splunk.com>

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Co-authored-by: Curtis Robert <crobert@splunk.com>

Author: pjanotti