Use polly to mock requests

[bmesuere]

Instead of simple mocks, use polly and recordings to mock all tests.

[Copilot]

Pull request overview

This pull request replaces manual mock implementations with Polly.js for HTTP recording and replay in tests. The change removes hardcoded API response data and manual fetch mocking in favor of real HTTP recordings that can be replayed during test execution.

Changes:

• Migrated from manual mocks to Polly.js with HTTP recording/replay
• Added Polly.js dependencies and setup infrastructure
• Created HAR recordings for API endpoints (taxonomy, taxa2lca, protinfo, pept2lca, pept2go)
• Updated test files to use Polly setup and teardown

Reviewed changes

Copilot reviewed 21 out of 28 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
package.json	Added Polly.js dev dependencies and test:record script
yarn.lock	Added Polly.js packages and transitive dependencies
tests/mocks/polly.ts	New Polly configuration and setup helper function
tests/mocks/mockFetch.ts	Removed manual fetch mock implementation
tests/mocks/apiData.ts	Removed hardcoded API response data
tests/recordings/*.har	Added HAR recordings for various API endpoints
tests/commands/unipept/taxonomy.test.ts	Updated to use Polly with proper setup/teardown
tests/commands/unipept/taxa2lca.test.ts	Updated to use Polly with proper setup/teardown
vitest.config.ts	Increased test timeout to 10000ms

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[pverscha]

This is looking good! No remarks from my side.