[7.x](backport #351) chore: separate unit tests from integration tests in CI pipeline

[mergify]

This is an automatic backport of pull request #351 done by Mergify.
Cherry-pick of ffb8bfe has failed:

On branch mergify/bp/7.x/pr-351
Your branch is ahead of 'origin/7.x' by 1 commit.
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You are currently cherry-picking commit ffb8bfe.
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	both modified:   .ci/Jenkinsfile

no changes added to commit (use "git add" and/or "git commit -a")

To fix up this pull request, you can check it out locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

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[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #462 updated

• Start Time: 2021-06-18T14:32:17.995+0000

• Duration: 5 min 40 sec

• Commit: 9bbcf28

Test stats 🧪

Test	Results
Failed	0
Passed	178
Skipped	0
Total	178

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