* Bump versions
* Prepare stable-v1 for version v1.15.0
* Prepare experimental-metrics for version v0.38.0
* Fix otlpmetric tests
Check pre 1.0 as well
* Update the chagelog
* Add Version func to otel/sdk
* Update sdk/resource to use sdk version
* Remove unused UserAgent from sdk/internal
* Add changes to changelog
* Update CHANGELOG.md
Co-authored-by: Robert Pająk <pellared@hotmail.com>
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Co-authored-by: Robert Pająk <pellared@hotmail.com>