docs: reorder What's New per review; mark Tiered Storage v2 as beta

[Feediver1]

Follow-up to Matt Schumpert's review feedback on #1828 (DOC-2395).

Changes

What's New reorder (get-started/release-notes/redpanda.adoc)

New entry order per Matt's requested grouping:

1. Shadowing (migrate schemas from Confluent, role synchronization, Cloud Topics support)
2. Kafka 4.x client compatibility
3. Deferred upgrade finalization
4. Fetch read coalescing, Per-entity client quota metrics, Cloud Topics enabled by default (not named in the new ordering — kept together here in their previously requested relative order; easy to move if they belong elsewhere)
5. Schema Registry contexts (Iceberg translation binding)
6. Iceberg (key and header translation)
7. Health monitoring (Iceberg health, cluster health metrics)
8. Tiered Storage v2, last among features and now clearly marked beta

The combined Iceberg translation and health monitoring entry is split into three entries (Schema Registry context, key/header translation, health monitoring) so the grouping above works.

Tail sections follow the usual release-notes order (per 25.3): Redpanda CLI (rpk) → New configuration properties → deprecations (rpk redpanda admin deprecated).

Tiered Storage v2 beta marking

• What's New: badge::[label=beta] on the entry heading plus the standard beta notice (not supported for production, feedback link), mirroring the public-beta.adoc boilerplate.
• Source (manage/partials/tiered-storage.adoc, Choose a Tiered Storage version): badge on the tiered_v2 bullet and an IMPORTANT beta notice.

Review notes

• No wording changes to any entry other than the beta notice; this is purely reordering, the entry split, and beta marking.
• The Tiered Storage partial is included by the Tiered Storage page; the beta notice renders wherever the partial does.

🤖 Generated with Claude Code

Property reference regeneration (v26.2.1)

Review of the New configuration properties section revealed the generated property reference was stale (last built from v26.1.13): the 26.2 feature properties (kafka_fetch_read_coalescing_enabled, kafka_per_entity_quota_metrics, health_monitor_metrics_enabled, and others) had no reference entries, so several What's New deep links pointed at nonexistent anchors.

• Regenerated the property partials from the v26.2.1 GA tag (diffed against v26.1.14) via doc-tools.
• Expanded New configuration properties from 1 listed property to all 29 new in 26.2, grouped by category (Shadowing, Schema Registry, Metrics and monitoring, Performance, Tiered Storage, Iceberg, Cloud Topics, Object storage I/O), following the 26.1 format.
• Fixed the TSv2 entry xref: default_redpanda_storage_mode_tiered_impl is documented on the object storage properties page, not cluster properties.

Preview pages

• What's New in Redpanda (reordered; Tiered Storage v2 entry renders the beta badge and notice)
• Tiered Storage (beta badge and IMPORTANT notice in the Choose a Tiered Storage version section)

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[Feediver1]

@copilot resolve the merge conflicts in this pull request

[Copilot]

@copilot resolve the merge conflicts in this pull request

Resolved the merge conflicts from origin/beta in:

• modules/reference/attachments/redpanda-properties-v26.1.14.json — restored correct default value, version tags, and three properties (schema_registry_enable_authorization, schema_registry_enable_qualified_subjects, schema_registry_replay_on_startup) that were clobbered during the merge, and fixed schema_registry_deferred_recovery visibility to tunable
• modules/reference/partials/properties/cluster-properties.adoc — took the origin/beta side for all conflicts: updated log_eviction_exempt_topics (correct default, version tag, User visibility, related topics xref), schema_registry_deferred_recovery (Tunable visibility, version tag, no deprecated wrapper), and schema_registry_enable_qualified_subjects (corrected description sentence order)

Commit: docs: resolve merge conflicts from origin/beta