github(pull_request_template): remove How to test section

[stevenjoezhang]

What does it do?

It's now very easy to check out a Pull Request with GitHub’s official command line tool: https://github.com/cli/cli

See also #3396

Screenshots

Pull request tasks

• Add test cases for the changes.
• Passed the CI test.

[coveralls]

Coverage remained the same at 98.282% when pulling e40b096 on pr into eef2eac on master.

[SukkaW]

IMHO I might reject the PR.

1. Not everyone uses GitHub CLI. I personally don't use GitHub CLI much.
2. Even with GitHub CLI, npm i && npm test is still required.

[ghost]

LGTM

[jiangtj]

If just run the test case, the Github Action is already executed. So I think this part is not necessary.

BTW, If you need to run PR in the project to see what happens, the command you might need to execute is yarn add <github-owner>/<package-name>#<ref>

I prefer to focus on the purpose of PR. Of course, I also saw how to contribute guidelines on the readme page of hexo. This is enough.

[SukkaW]

If just run the test case, the Github Action is already executed. So I think this part is not necessary.

Is It necessary to run a unit test even before creating a new PR.

I prefer to focus on the purpose of PR. Of course, I also saw how to contribute guidelines on the readme page of hexo. This is enough.

We might have to update the contributing guideline then.

[curbengh]

I agree with this PR. Initially I thought npm i && npm test is redundant in a Node project, but I think it can be reminder especially to a PR creator, to run a test instead of solely relying on Action.