refactor: use mockery for mocks

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.31%. Comparing base (9fe42a8) to head (7539a08).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1944   +/-   ##
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  Coverage   90.31%   90.31%           
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  Files          90       90           
  Lines        6444     6444           
=======================================
  Hits         5820     5820           
  Misses        482      482           
  Partials      142      142           

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[Copilot]

Pull request overview

This PR refactors the test infrastructure to use mockery v3 for automated mock generation, replacing hand-written mock implementations with mockery-generated ones. This improves test maintainability by ensuring mocks stay in sync with their interfaces and reduces boilerplate code.

Key Changes

• Introduces mockery v3 as a code generation tool integrated into the build process
• Migrates three packages (api, cache, lists) from manual to generated mocks
• Removes legacy hand-written mock implementations and updates test files to use new mocks
• Includes a spelling fix: "exluded" → "excluded" in test descriptions

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
.mockery.yaml	New mockery v3 configuration defining mock generation rules for api, cache, and lists packages
Makefile	Adds go tool mockery to the generate target
go.mod / go.sum	Adds mockery v3.6.1 and its transitive dependencies
cache/mocks.go	Generated mock for ExpiringCache interface (non-test file for cross-package use)
api/mocks_test.go	Generated mocks for BlockingControl, ListRefresher, Querier, and CacheControl interfaces
lists/mocks_test.go	Generated mock for FileDownloader interface
resolver/mocks_test.go	Removes hand-written mockExpiringCache (replaced by generated cache.MockExpiringCache)
resolver/caching_resolver_test.go	Updates to use generated cache mock; includes spelling fix
api/api_interface_impl_test.go	Removes hand-written mocks and updates tests to use generated mocks with automatic cleanup

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