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

[ti-chi-bot]

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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[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

To merge this cherry pick:

1. It must be LGTMed and approved by the reviewers firstly.
2. For pull requests to TiDB-x branches, it must have no failed tests.
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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
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[gemini-code-assist]

Code Review

This pull request updates various download URLs by migrating the domain from download.pingcap.org to download.pingcap.com across multiple test scripts and documentation files. The review feedback highlights instances where the insecure http protocol is still being used in the updated URLs and recommends switching to https for improved security and consistency.

[gemini-code-assist]

The URL for sync_diff_inspector uses http while the tidb-server URL in the line above uses https. It is recommended to use https for consistency and security.

[gemini-code-assist]

These download URLs use http. It is recommended to use https to ensure the security and integrity of the downloaded binaries.

Suggested change

	sync_diff_inspector_download_url="http://download.pingcap.com/tidb-enterprise-tools-nightly-linux-amd64.tar.gz"
	mydumper_download_url="http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz"
	sync_diff_inspector_download_url="https://download.pingcap.com/tidb-enterprise-tools-nightly-linux-amd64.tar.gz"
	mydumper_download_url="https://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz"

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release-8.1@05534b3). Learn more about missing BASE report.

Additional details and impacted files

Components	Coverage Δ
cdc	∅ <0.0000%> (?)
dm	51.0757% <0.0000%> (?)
engine	63.4189% <0.0000%> (?)

Flag	Coverage Δ
unit	53.8212% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

@@               Coverage Diff                @@
##             release-8.1     #12584   +/-   ##
================================================
  Coverage               ?   53.8212%           
================================================
  Files                  ?        423           
  Lines                  ?      63722           
  Branches               ?          0           
================================================
  Hits                   ?      34296           
  Misses                 ?      26734           
  Partials               ?       2692           

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[ti-chi-bot]

@wuhuizuo: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-verify	af7ff39	link	true	/test pull-verify
pull-cdc-integration-kafka-test	af7ff39	link	true	/test pull-cdc-integration-kafka-test
pull-cdc-integration-pulsar-test	af7ff39	link	true	/test pull-cdc-integration-pulsar-test

Full PR test history. Your PR dashboard.

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