tiflash: remove deprecated http_port

[Lloyd-Pottiger]

First-time contributors' checklist

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

What is changed, added or deleted? (Required)

http_port has been deprecated since v7.1.0, remove all description about it.

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

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

[Lloyd-Pottiger]

/cc @JaySon-Huang

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[ti-chi-bot[bot]]

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

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[qiancai]

Removed the needs-cherry-pick-release-8.2 label because the v8.2 docs have been archived at https://docs-archive.pingcap.com/zh/tidb/v8.2 and will no longer receive new updates.

[qiancai]

/approve

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: qiancai

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #19610.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #19611.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #19612.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.3: #19613.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #19614.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.4: #19615.