Hierarchical grouping deprecation (ongoing)

This project will move any projects using the mobile grouping configuration as defined here: https://github.com/getsentry/sentry/blob/44d816f0b9a9450fdf47136313b3a4b955ceab84/src/sentry/grouping/strategies/configurations.py#L160-L188

By: @armenzg (#74203)

Various fixes & improvements

• chore(data-secrecy): FF for Data Secrecy (#74749) by @iamrajjoshi
• feat(utils): Add core CircuitBreaker functionality (#74560) by @lobsterkatie
• fix(replay): fix new banner check for hydration errors (#74755) by @aliu39
• fix: split samples by threadid (#74738) by @JonasBa
• Allow AI to be nullable (#74746) by @colin-sentry
• Fix creating crash free session alerts (#74750) by @saponifi3d
• feat(utils): Add helpers for circuit breaker and circuit breaker tests (#74559) by @lobsterkatie
• chore(typing): stricter decorator type checking for leaky bucket (#74687) by @vartec
• feat(uptime): Bump default timeout for onboarding monitors to 10s (#74739) by @wedamija
• chore(similarity): Add seer failure reason to backfill log (#74735) by @jangjodi
• fix(insights): Cache page alert re-rendering (#74737) by @narsaynorath
• chore(saml2): Add flag for Single-Logout (#74736) by @leedongwei
• chore(seer): Add timing metric to requests to Seer (#74688) by @lobsterkatie
• feat(utils): Add stub for rate-limit-based CircuitBreaker class (#74557) by @lobsterkatie
• Separates rejecting policy and throttling policy in Sentry tags and spans (#74733) by @xurui-c
• feat(tracing): reparent ssr spans under pageload txn and under browser request span (#74675) by @JonasBa
• ref(toolbar): add feature flag search (#74697) by @michellewzhang
• remove temporary flagpole option (#74597) by @nhsiehgit
• chore(issues): cleanup old issue annotations (#74684) by @oioki
• ref: improve signatures of tsdb (#74725) by @asottile-sentry
• feat(performance): enable long animation frame support for internal t… (#74637) by @KevinL10
• fix(metrics): Introduce new styles to alias field (#74722) by @priscilawebdev
• feat(dashboards): Add split source field to API response (#74717) by @narsaynorath
• ref: fix Future types for sentry_metrics routing_producer (#74682) by @asottile-sentry

Plus 296 more