Fix: don't include 8.x packages in stack 7.x jobs

[mtojek]

Resolves: #2144

This PR modifies the Jenkinsfile to fix daily jobs for stack 7.x. Tests have been failing since a long time now.

[elasticmachine]

💔 Build Failed

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Build stats

• Start Time: 2021-12-13T14:19:39.330+0000

• Duration: 4 min 3 sec

• Commit: fa82373

Steps errors

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Read JSON from files in the workspace.

• Took 0 min 0 sec . View more details here
• Description: Cannot invoke method startsWith() on null object

Google Storage Download

• Took 0 min 0 sec . View more details here

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[mtojek]

Looks good for the CI job, so let's merge it.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2021-12-13T14:31:19.905+0000

• Duration: 80 min 48 sec

• Commit: a191297

Test stats 🧪

Test	Results
Failed	0
Passed	3599
Skipped	5
Total	3604

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To re-run your PR in the CI, just comment with:

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