test(benchmark): skip checking completion time in hot processing

[curbengh]

What does it do?

After #3991, the CI on master branch is failing because the hot processing takes less than 10 seconds.

This PR skips completion time and line number checking in hot processing.

How to test

git clone -b benchmark-hot-processing https://github.com/curbengh/hexo.git
cd hexo
npm install
npm test

Pull request tasks

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

[coveralls]

Coverage remained the same at 97.111% when pulling 88506bc on curbengh:benchmark-hot-processing into 91e5c32 on hexojs:master.

[dailyrandomphoto]

We should focus on improving performance for bigger sites.
How about adding more posts to the benchmark site. (300 => 500 or 1000)
The larger the site, the more noticeable the change in performance.

[SukkaW]

@dailyrandomphoto
The benchmark performed by CI should be considered as a part of a unit test, to see if there is any performance regression or gained through each commit. So we'd like to have a relatively small site with 300 posts so that each build could be finished in 2 minutes.

As you can see in #3941 & #3812, performance regression is already noticeable enough.

[dailyrandomphoto]

Ok, I see.