v1.2.0-rc.1

Changelog

• 645d59f chore(examples): environment provision example (#3867)
• 10596b7 chore(synthetic-monitoring): simplifying slack messages (#3872)
• 82ebab7 chore: add run cmd -f description (#3857)
• ff5e921 docs(concepts): add org tokens (#3871)
• a60d427 docs(recipes): fix demo links (#3875)
• 5bc9559 docs(recipes): standardize recipes part 2 (#3860)
• 82664db docs(run groups): improved images and code samples (#3868)
• 750176a fix(agent): datastore headers proto type (#3874)
• f2c866c fix(synthetic-monitoring): update synthetic monitoring messaging (#3873)