Y24-286-1 - Fix RVI BCL Library prep requests

[BenTopping]

Part 1 of https://github.com/sanger/sequencescape/issues/4306

Changes proposed in this pull request

• Updates transfer request to start sibiling requests when going from pending to processed_1

Instructions for Reviewers

[All PRs] - Confirm PR template filled
[Feature Branches] - Review code
[Production Merges to main]
    - Check story numbers included
    - Check for debug code
    - Check version

[codecov[bot]]

Codecov Report

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

Project coverage is 86.39%. Comparing base (a2f61b8) to head (5896f54). Report is 9 commits behind head on develop.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #4482 +/- ## =========================================== - Coverage 86.49% 86.39% -0.10% =========================================== Files 1390 1390 Lines 29819 29819 =========================================== - Hits 25791 25762 -29 - Misses 4028 4057 +29 ```

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