fix: check ptr value for visited exception chains

[giortzisg]

Description

Changing the implementation of tracking visited errors in the chain when parsing to exception groups, to use the pointer of the error if applicable, rather than trying to hash the error itself, to avoid cases where the error itself is unhashable.

Issues

• resolves: panic: hash of unhashable type #1131
• resolves: GO-97

[linear]

GO-97 panic: hash of unhashable type

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.93%. Comparing base (2d82e58) to head (9154012).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1132      +/-   ##
==========================================
- Coverage   86.97%   86.93%   -0.04%     
==========================================
  Files          60       61       +1     
  Lines        5557     5558       +1     
==========================================
- Hits         4833     4832       -1     
- Misses        539      541       +2     
  Partials      185      185              

☔ 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.