releases: add release notes for v8.1.0

[Oreoxmt]

What is changed, added or deleted? (Required)

Add release notes for v8.1.0.

Which TiDB version(s) do your changes apply to? (Required)

Tips for choosing the affected version(s):

By default, CHOOSE MASTER ONLY so your changes will be applied to the next TiDB major or minor releases. If your PR involves a product feature behavior change or a compatibility change, CHOOSE THE AFFECTED RELEASE BRANCH(ES) AND MASTER.

For details, see tips for choosing the affected versions (in Chinese).

• [x] master (the latest development version)
• [x] v8.1 (TiDB 8.1 versions)
• [ ] v8.0 (TiDB 8.0 versions)
• [ ] v7.6 (TiDB 7.6 versions)
• [ ] v7.5 (TiDB 7.5 versions)
• [ ] v7.4 (TiDB 7.4 versions)
• [ ] v7.1 (TiDB 7.1 versions)
• [ ] v6.5 (TiDB 6.5 versions)
• [ ] v6.1 (TiDB 6.1 versions)
• [ ] v5.4 (TiDB 5.4 versions)
• [ ] v5.3 (TiDB 5.3 versions)
• [ ] v5.2 (TiDB 5.2 versions)
• [ ] v5.1 (TiDB 5.1 versions)

What is the related PR or file link(s)?

• This PR is translated from:
• Other reference link(s):

Do your changes match any of the following descriptions?

• [ ] Delete files
• [ ] Change aliases
• [ ] Need modification after applied to another branch
• [ ] Might cause conflicts after applied to another branch

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[ti-chi-bot[bot]]

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@ywqzzy: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@D3Hunter: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@xhebox: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@ljun0712: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@flowbehappy: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@yibin87: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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LGTM

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@JaySon-Huang: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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Rest LGTM

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@BornChanger: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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br part change lgtm.

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@guo-shaoge: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@Connor1996: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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LGTM

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-15 08:45:45.687335758 +0000 UTC m=+1642899.444471327: :ballot_box_with_check: agreed by qiancai.
• 2024-05-21 11:28:25.399414693 +0000 UTC m=+2171059.156550266: :ballot_box_with_check: agreed by hfxsd.

[ti-chi-bot[bot]]

@Frank945946: adding LGTM is restricted to approvers and reviewers in OWNERS files.

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