ci: move spotless and api check to build step.

[MahmoudMabrok]

Guidelines

Describe the big picture of your changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.

Types of changes

What types of changes does your code introduce?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Preparing a pull request for review

Ensure your change is properly formatted by running:

$ ./gradlew spotlessApply

Please correct any failures before requesting a review.

[skydoves]

Thank you for your contribution, @MahmoudMabrok. But the reason of this is, I want to clarify the reason of the CI failures without going to see the details when the build failed.

[MahmoudMabrok]

@skydoves Thanks for reply. I agree with you.

so we can run all as single job with multiple steps, so we reduce time for 2 extra [checkout, run gradle], also gradle tasks will be cached so lower time.

[MahmoudMabrok]

could you please check ? @skydoves , if it fine and merged please add label 'hacktoberfest-accepted'

[MahmoudMabrok]

Please check @skydoves