Testing Release Eigth

• feat: use StrinView to speed up query for main by @haohuaijin in openobserve/openobserve#7400
• fix: dashboard cancel api on unmounted by @ktx-vaidehi in openobserve/openobserve#7405
• fix: tantivy panic when the records mismatch by @hengfeiyang in openobserve/openobserve#7412
• test:pipeline-core-tests by @neha00290 in openobserve/openobserve#7404
• chore: upgrade rust to 2025-05-20 by @haohuaijin in openobserve/openobserve#7316
• fix: chat_stream should be routed to queriers by @Subhra264 in openobserve/openobserve#7413
• fix: cancel query multiple panels by @ktx-vaidehi in openobserve/openobserve#7416
• fix: delete result cache to also delete aggregation cache by @Loaki07 in openobserve/openobserve#7425
• feat: upgrade datafusion to v47.0.0 by @haohuaijin in openobserve/openobserve#7421
• ci: license check by @hengfeiyang in openobserve/openobserve#7432
• chore: remove bucket_num from histogram UDF by @ByteBaker in openobserve/openobserve#7427
• fix: UI performance optimisation (openobserve/openobserve#7254) by @bjp232004 in openobserve/openobserve#7415
• fix: openfga migration for ai by @Subhra264 in openobserve/openobserve#7434
• fix: disable search around for aggregation query by @bjp232004 in openobserve/openobserve#7441
• test: e2e- sortorder-testcases by @neha00290 in openobserve/openobserve#7445
• feat: sync rc9 to main(BE) by @hengfeiyang in openobserve/openobserve#7447