*: remove most of Telemetry related contents

[bb7133]

First-time contributors' checklist

• [x] I've signed Contributor License Agreement that's required for repo owners to accept my contribution.

What is changed, added or deleted? (Required)

Update docs in order to sync with https://github.com/pingcap/tidb/pull/51202

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.

• [x] master (the latest development version)
• [ ] v8.4 (TiDB 8.4 versions)
• [ ] v8.3 (TiDB 8.3 versions)
• [ ] v8.2 (TiDB 8.2 versions)
• [x] v8.1 (TiDB 8.1 versions)
• [ ] v7.5 (TiDB 7.5 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)

(Let's ignore the DMR versions)

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

• This PR is translated from:
• Other reference link(s): https://github.com/pingcap/tidb/pull/51202

Do your changes match any of the following descriptions?

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

[ti-chi-bot[bot]]

PR needs rebase.

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[qiancai]

@bb7133 Would you please involve a tech reviewer for this PR? Thanks.

[ti-chi-bot[bot]]

@shiyuhang0: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-10-25 06:34:37.809993942 +0000 UTC m=+592078.506784547: :ballot_box_with_check: agreed by qiancai.
• 2024-10-25 07:09:53.714554457 +0000 UTC m=+594194.411345090: :ballot_box_with_check: agreed by hfxsd.

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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Needs approval from an approver in each of these files:

• ~~OWNERS~~ [qiancai]

Approvers can indicate their approval by writing /approve in a comment Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19215.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.2: #19216.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #19217.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19218.