fix: DuplicatedKeyException not propagated as cause on Follower forwarded commands

[arcadedb-support]

Fix for a customer-reported issue: DuplicatedKeyException not propagated as cause on Follower forwarded commands.

I traced the root cause, reproduced it with a test, and verified the fix. Internal tracking: https://github.com/ArcadeData/arcadedb-operations/issues/526

Please review before merging.

[mergify]

Tick the box to add this pull request to the merge queue (same as @mergifyio queue).

• Queue this pull request

[codacy-production]

Up to standards ✅

🟢 Issues 0 issues

Results:
0 new issues

View in Codacy

🟢 Metrics 0 complexity

Metric	Results
Complexity	0

View in Codacy

🟢 Coverage 88.89% diff coverage · -7.22% coverage variation

Metric	Results
Coverage variation	✅ -7.22% coverage variation
Diff coverage	✅ 88.89% diff coverage

View coverage diff in Codacy

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (115dfa0)	134558	100099	74.39%
Head commit (54ee012)	166385 (+31827)	111765 (+11666)	67.17% (-7.22%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#5014)	27	24	88.89%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

_{NEW Get contextual insights on your PRs based on Codacy's metrics, along with PR and Jira context, without leaving GitHub. Enable AI reviewer
TIP This summary will be updated as you push new changes.}

[codecov]

Codecov Report

❌ Patch coverage is 74.07407% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.40%. Comparing base (115dfa0) to head (54ee012).

Files with missing lines	Patch %	Lines
...rcadedb/server/ha/raft/RaftReplicatedDatabase.java	74.07%	3 Missing and 4 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5014      +/-   ##
============================================
- Coverage     65.40%   65.40%   -0.01%     
- Complexity      817      823       +6     
============================================
  Files          1685     1685              
  Lines        134558   134582      +24     
  Branches      28788    28797       +9     
============================================
+ Hits          88004    88017      +13     
- Misses        34496    34497       +1     
- Partials      12058    12068      +10     

☔ View full report in Codecov by Harness.
📢 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.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.