Bump ESLint to 10.8.1 and address new lint errors

[julianna-ciq]

Summary

• updates ESLint from 9.39.5 to 10.8.1 and @eslint/js to 10.0.1 across every workspace that declares them
• replaces the Workbench's ESLint-9-only import plugin with ESLint-10-compatible eslint-plugin-import-x
• removes the Workbench React lint plugin, which only supplied an obsolete JSX bookkeeping rule and disabled rules
• fixes the new ESLint 10 preserve-caught-error violation while retaining the existing failover error message
• fixes the new ESLint 10 no-useless-assignment violation in Workbench context-copy naming

Supersedes #2120.

Why

ESLint 10 enables additional recommended correctness rules. The existing Workbench plugins also did not declare ESLint 10 compatibility, which left the dependency tree invalid when upgrading only the core ESLint package.

Validation

• npm run lint — passes (79 pre-existing Workbench warnings remain)
• npm ls eslint @eslint/js eslint-plugin-import-x --all — one deduplicated ESLint 10.8.1 tree, no invalid peers
• npm run build --workspace @finos/fdc3-get-agent — passes
• npm test --workspace @finos/fdc3-get-agent — 38 tests pass
• Workbench and reference UI builds completed successfully during the full build

The full repository build/test commands still report the pre-existing missing json-canonicalize dependency in @finos/fdc3-security. An initial parallel full-test run also timed out starting the fdc3-standard Vitest workers; this is unrelated to ESLint and occurred under concurrent build/test load.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.03%. Comparing base (cb00631) to head (1b304fe).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2127   +/-   ##
=======================================
  Coverage   95.03%   95.03%           
=======================================
  Files          73       73           
  Lines        4251     4253    +2     
  Branches      596      679   +83     
=======================================
+ Hits         4040     4042    +2     
  Misses        211      211           

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