fix: v2 redactions were reporting validation error if the assertion was redacted

[gpeacock]

Fixed the validation logic to validate that the redaction URI refers to a valid claim and the claim has a reference to the assertion, and then validate that the assertion has been removed from the relevant assertion store.

[codecov]

Codecov Report

❌ Patch coverage is 47.82609% with 24 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.12%. Comparing base (8ba07fc) to head (c1267ab).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
sdk/src/claim.rs	40.00%	24 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1282      +/-   ##
==========================================
+ Coverage   78.03%   78.12%   +0.08%     
==========================================
  Files         150      150              
  Lines       38328    38317      -11     
==========================================
+ Hits        29910    29934      +24     
+ Misses       8418     8383      -35     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.