chore: replace deprecated PingCAP download domains

[wuhuizuo]

Summary

• replace deprecated download.pingcap.org references with download.pingcap.com
• replace deprecated charts.pingcap.org references with charts.pingcap.com where present
• keep the existing paths and protocols unchanged

Validation

• git diff --check
• verified no remaining download.pingcap.org / charts.pingcap.org references in the patched branch

Summary by CodeRabbit

• Chores
  • Updated integration test binary download links to a new download domain and upgraded referenced community binaries from v6.0.0 to v8.5.0 to ensure tests fetch current releases.

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Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[gemini-code-assist]

Code Review

This pull request updates the download domain from pingcap.org to pingcap.com in the integration tests documentation and the binary download script. The review feedback suggests updating the example version in the README to align with current defaults and refactoring the script to use a local variable for the base URL to improve maintainability.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 550b4926-98e9-4b07-a8fd-7ed284511b2b

📥 Commits

Reviewing files that changed from the base of the PR and between 4588ae2 and 1fdce37.

📒 Files selected for processing (1)

• tests/integration_tests/README.md

✅ Files skipped from review due to trivial changes (1)

• tests/integration_tests/README.md

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📝 Walkthrough

Walkthrough

Updated TiDB community binary references: tests/integration_tests/README.md bumped toolkit/server tarball versions from v6.0.0 to v8.5.0 and switched download domain to download.pingcap.com; tests/scripts/download-integration-test-binaries.sh changed download domain from download.pingcap.org to download.pingcap.com.

Changes

Cohort / File(s)	Summary
README version + domain tests/integration_tests/README.md	Bumped referenced TiDB community tarballs from v6.0.0 to v8.5.0 and updated download URLs to download.pingcap.com.
Script domain change tests/scripts/download-integration-test-binaries.sh	Replaced download domain download.pingcap.org → download.pingcap.com for toolkit and server tarball URLs; filenames and extraction logic unchanged.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 I hopped through links with nimble paws,
From old v6 to v8 applause,
Domains realigned, the downloads hum,
Tests ready now — here I come! 🎉

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (2 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is missing required sections from the template (Issue Number, What is changed and how it works, Tests, Questions, Release note) and does not follow the expected structure.	Add required template sections including Issue Number linking, detailed explanation of changes, test type, answers to compatibility/documentation questions, and release note.
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: replacing deprecated PingCAP download domains, which directly matches the core purpose of the PR.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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