Run tests parallelly on CI

[Goooler]

Description

This is a regression of using toolchain, reverts some changes in #1294 & #1453 to save more time on CI, especially for the Windows related builds. More result diffs you can see Goooler#39.

Checklist

• PR description added
• tests are added
• KtLint has been applied on source code itself and violations are fixed
• documentation is updated
• CHANGELOG.md is updated

In case of adding a new rule:

• Rule is added to rules documentation

[shashachu]

@Goooler i fixed the issue with the PR build; you should be able to rebase and re-run the checks.

[paul-dingemans]

@Goooler Can you have another look? I think the 'old' jobs need to be removed as the build now keeps waiting.

[Goooler]

That might be related to the status check in repo settings, see https://stackoverflow.com/a/69169858/19772203.

@shashachu Can you take a look this in settings?

[Goooler]

@paul-dingemans No need to note this change, it's not user noticeable.

[shashachu]

@Goooler @paul-dingemans i updated the required checks for merging. we will have to update this whenever we change the build jdk versions, but that shouldn't be a huge deal.

thanks for this change! i have also noticed the windows build takes forever now.

[shashachu]

For future reference (for myself and any other admins we may add in the future), the checks are in Settings -> Branches -> Branch protection rules (master). I had to delete the old checks and add the new ones here: