chore: skip ceph tests

[mdelapenya]

What does this PR do?

It skip ceph tests to avoid confusion while we find the root cause of the flakiness.

Why is it important?

It's causing noise in both merges and PRs, specially from Beats.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have run the Unit tests for the CLI, and they are passing locally
• I have run the End-2-End tests for the suite I'm working on, and they are passing locally
• I have noticed new Go dependencies (run make notice in the proper directory)

Related issues

• Relates Investigate why Ceph tests are flaky, as it seems to fail with quite a frequency #607, chore: increase timeout for Ceph (#618) backport for 6.8.x #622, fix: do not override compose configurations when syncing from beats #630
• Relates fix: use supported-versions variables in ceph-api beats#23602

[elasticmachine]

💚 Build Succeeded

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Build stats

• Build Cause: Pull request #635 opened

• • Start Time: 2021-01-22T01:12:35.236+0000

• Duration: 22 min 55 sec

• Commit: 8eb8c08

Test stats 🧪

Test	Results
Failed	0
Passed	69
Skipped	11
Total	80

💚 Flaky test report

Tests succeeded.

Expand to view the summary

Test stats 🧪

Test	Results
Failed	0
Passed	69
Skipped	11
Total	80

[mdelapenya]

Merging, as tests passed