handle sample dropdown enabling through signal

[walshmm]

Description of work

Explanation of work

To test

Dev testing

CIS testing

# replace with your test script below

Link to EWM item

EWM#<ticket_number>

Verification

• the author has read the EWM story and acceptance critera
• the reviewer has read the EWM story and acceptance criteria
• the reviewer certifies the acceptance criteria below reflect the criteria in EWM

Acceptance Criteria

This list is for ease of reference, and does not replace reading the EWM story as part of the review. Verify this list matches the EWM story before reviewing.

• acceptance criterion 1
• acceptance criterion 2

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.18%. Comparing base (95d2baa) to head (d004a80).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #644      +/-   ##
==========================================
- Coverage   96.20%   96.18%   -0.02%     
==========================================
  Files          76       76              
  Lines        6350     6350              
==========================================
- Hits         6109     6108       -1     
- Misses        241      242       +1     

Flag	Coverage Δ
integration	50.11% <ø> (ø)
unittests	95.90% <ø> (-0.02%)	⬇️

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