fix: catch update_reward_lock_metadata exceptions

[glevco]

Motivation

Correctly handle exceptions raised by update_reward_lock_metadata().

Acceptance Criteria

• Move update_reward_lock_metadata() call to inside the validate_full() try block.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.90%. Comparing base (007eb6e) to head (adedf91).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1029      +/-   ##
==========================================
- Coverage   84.92%   84.90%   -0.02%     
==========================================
  Files         298      297       -1     
  Lines       22962    22910      -52     
  Branches     3470     3464       -6     
==========================================
- Hits        19500    19452      -48     
  Misses       2773     2773              
+ Partials      689      685       -4     

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