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.
3. AFTER it has lgtm and approved labels, please wait for the cherry-pick merging approval from triage owners.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[gemini-code-assist]

Code Review

This pull request updates several download URLs across the repository, migrating from the pingcap.org domain to pingcap.com. The review feedback highlights security concerns regarding the use of insecure http protocols for binary downloads and suggests standardizing on https for consistency and safety. Additionally, a minor grammatical correction was suggested for the documentation.

[gemini-code-assist]

The download URLs use inconsistent protocols: line 6 uses https while line 7 uses http. For security and consistency, both should use https when downloading executable binaries. Additionally, 'build' should be 'built' for correct grammar.

Suggested change

	* `bin/tidb-server` can be downloaded from [tidb-master-linux-amd64](https://download.pingcap.com/tidb-master-linux-amd64.tar.gz) or installed by [tiup](https://github.com/pingcap/tiup), you can use the command `find ~/.tiup -name tidb-server` to locate `tidb-server` binary file and copy it
	* `bin/sync_diff_inspector` # can be downloaded from [tidb-enterprise-tools-latest-linux-amd64](http://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz) or build from [source code](https://github.com/pingcap/tidb-tools)
	* `bin/tidb-server` can be downloaded from [tidb-master-linux-amd64](https://download.pingcap.com/tidb-master-linux-amd64.tar.gz) or installed by [tiup](https://github.com/pingcap/tiup), you can use the command `find ~/.tiup -name tidb-server` to locate `tidb-server` binary file and copy it
	* `bin/sync_diff_inspector` # can be downloaded from [tidb-enterprise-tools-latest-linux-amd64](https://download.pingcap.com/tidb-enterprise-tools-latest-linux-amd64.tar.gz) or built from [source code](https://github.com/pingcap/tidb-tools)

[gemini-code-assist]

These URLs use http for downloading binaries, which is insecure. Since other parts of the codebase (e.g., dm/tests/tiup/lib.sh) already use https for the same domain and files, these should be updated to https as well.

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"

[ti-chi-bot]

@wuhuizuo: The following test 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	97db2bf	link	true	/test pull-verify

Full PR test history. Your PR dashboard.

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