Unleash 5.12: Application view, context field search, and increased metrics retention.

Unleash 5.12 introduces several enhancements, including more powerful A/B testing capabilities through dependent feature flag variants, allowing for a broader range of testing scenarios by enabling flags to depend not only on binary states but also on multiple variants. This update provides three options for parent feature values: enabled, disabled, and enabled with variants, offering users greater flexibility and creativity in their testing configurations. Additionally, the update improves security by allowing API tokens to function as bearer tokens, aligning with the goal of becoming compliant with HTTP RFC 9110, which enhances security practices by replacing the colon separator with a "Bearer" prefix, while still supporting the previous format.