V2 Bait Library Layout Preview fix

[BenTopping]

Changes proposed in this pull request

• Bait Library Layout preview in api v1 returned well_layout (as a layout attribute). This updates the v2 api to also return well_layout.

Instructions for Reviewers

Linked Limber PR: https://github.com/sanger/limber/pull/2040 There is also an integration suite PR.

[codecov[bot]]

Codecov Report

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

Project coverage is 86.46%. Comparing base (016db5d) to head (9b1f5a5). Report is 3 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4478 +/- ## =========================================== + Coverage 86.39% 86.46% +0.07% =========================================== Files 1390 1390 Lines 29816 29816 =========================================== + Hits 25759 25781 +22 + Misses 4057 4035 -22 ```

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