[WIP]: add the release notes for v8.5.8

[qiancai]

What is changed, added or deleted? (Required)

As in the title

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• master (the latest development version)
• v9.0 (TiDB 9.0 versions)
• v8.5 (TiDB 8.5 versions)
• v8.1 (TiDB 8.1 versions)
• v7.5 (TiDB 7.5 versions)
• v7.1 (TiDB 7.1 versions)
• v6.5 (TiDB 6.5 versions)

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Summary by CodeRabbit

• Documentation
  • Added the TiDB 8.5.8 release notes.
  • Documented improvements to memory usage, query optimization, concurrency, change data capture, batching, and event processing.
  • Documented bug fixes across TiDB, TiKV, PD, BR, TiCDC, and TiDB Lightning, including stability, security, backup, scheduling, failover, checkpoint, and import reliability improvements.

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• releases/release-8.5.8.md

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📝 Walkthrough

Walkthrough

Adds the TiDB 8.5.8 release notes. The document includes release metadata, improvements, and fixes across TiDB, TiKV, PD, BR, TiCDC, and TiDB Lightning.

Changes

TiDB 8.5.8 release documentation

Layer / File(s)	Summary
Release metadata and improvements releases/release-8.5.8.md	Adds release metadata and documents improvements for TiDB, TiKV, and TiCDC.
TiDB fixes releases/release-8.5.8.md	Documents fixes for TiDB DDL, planning, memory, parsing, security, diagnostics, and transaction behavior.
TiKV and PD fixes releases/release-8.5.8.md	Documents fixes for backup, ingestion, scheduling, security, resource control, endpoints, and storage behavior.
BR and TiCDC fixes releases/release-8.5.8.md	Documents BR restore fixes and TiCDC fixes for failover, checkpoints, sinks, ordering, initialization, compatibility, and resource handling.
TiDB Lightning fixes releases/release-8.5.8.md	Documents fixes for import consistency, cleanup, Parquet decimal decoding, and canceled jobs.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Merge Risk: 🔵 Low · up to e3766

This PR adds the v8.5.8 release notes, but one entry remains ambiguous and two batching entries need their source confirmed to avoid publishing inaccurate or unclear documentation. It is mergeable with explicit owner follow-up on these bounded content issues.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description includes the required headings but gives no meaningful change details, selects no TiDB version, and provides no reference links.	Describe the release-note changes, select the applicable v8.5 version, and add relevant PR or file links.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the addition of TiDB v8.5.8 release notes, which is the main change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[zhangjinpeng87]

LGTM for TiKV

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Actionable comments posted: 2

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• releases/release-8.5.8.md

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All committers have signed the CLA.

[YangKeao]

Rest LGTM for sql-infra, ddl, dxf, lightning

[solotzg]

LGTM for execution

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