Fix select pipes

[percevalw]

Description

• Disabled pipes are now correctly ignored in the Pipeline.preprocess method

Checklist

• [x] If this PR is a bug fix, the bug is documented in the test suite.
• [x] Changes were documented in the changelog (pending section).
• [x] If necessary, changes were made to the documentation (eg new pipeline).

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.00%. Comparing base (084aa4f) to head (bab3e53).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #267 +/- ## ========================================== + Coverage 96.95% 97.00% +0.05% ========================================== Files 255 255 Lines 8591 8618 +27 ========================================== + Hits 8329 8360 +31 + Misses 262 258 -4 ```

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