Project 42 platform v0.51.0

What's Changed

• feat(identity): persist linked identities and link transactions AB#6331 by @kristopherjturner in #84
• feat(identity): add verified GitHub account linkage AB#6332 by @kristopherjturner in #85
• AB#6333 Add recoverable duplicate-account merge service by @kristopherjturner in #86
• Prepare platform v0.51.0 by @kristopherjturner in #87

Full Changelog: v0.50.0...v0.51.0