Fix license (release-7.1)

[JaySon-Huang]

What problem does this PR solve?

Issue Number: close #7968

Problem Summary:

The license header should be "PingCAP, Inc" instead of "PingCAP, Ltd", ref #7960

What is changed and how it works?

Fix the license by using the script in https://github.com/JaySon-Huang/licenseheaders/tree/my_fork, then format the code by .clang-format

gh repo clone JaySon-Huang/licenseheaders
./fix_license.sh /path/to/tiflash
cd /path/to/tiflash
python3 format-diff.py --diff_from `git merge-base upstream/master  HEAD`

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/hold

[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/run-all-tests

[JaySon-Huang]

/run-all-tests

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lidezhu, Lloyd-Pottiger

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [Lloyd-Pottiger,lidezhu]

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]

[LGTM Timeline notifier]

Timeline:

• 2023-08-18 07:43:01.639946444 +0000 UTC m=+876146.188962425: ☑️ agreed by Lloyd-Pottiger.
• 2023-08-18 08:00:49.105526142 +0000 UTC m=+877213.654542130: ☑️ agreed by lidezhu.

[JaySon-Huang]

/unhold