test(decrypt): add integration tests

[athith-g]

Adds integration tests for decrypt.py.

Also:

• Moves INPUT_DIR and INPUT_TEXT to utils.py (references in other files to these constants will be changed in separate PR)
• Moves fixture_encrypted_files to conftest.py (Usage in test_decrypt.py will be removed in separate PR)
• Creates hello3.c4gh file that was encrypted with bob.pk for use in integration test
• Minor change to error message in decrypt.py

Summary by Sourcery

Add integration tests for decrypt.py and refactor test utilities and fixtures for better organization and reusability.

Enhancements:

• Move INPUT_DIR and INPUT_TEXT constants to utils.py for better reusability.
• Move fixture_encrypted_files to conftest.py for shared usage across tests.
• Minor change to error message in decrypt.py to include file name.

Tests:

• Add integration tests for decrypt.py to ensure proper decryption functionality.
• Create hello3.c4gh file encrypted with bob.pk for use in integration tests.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request adds integration tests for decrypt.py, ensuring that the decryption functionality works as expected. It also refactors some test utilities and fixtures for better code organization and reusability. Additionally, a minor change was made to the error message in decrypt.py to include the file name instead of the full path.

File-Level Changes

Files	Changes
tests/utils.py tests/conftest.py	Refactored test utilities and fixtures to improve code organization and reusability.
tests/decryption/test_integration.py	Added comprehensive integration tests for decrypt.py to ensure proper decryption functionality.

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[sourcery-ai]

Hey @athith-g - I've reviewed your changes and they look great!

Here's what I looked at during the review

• 🟡 General issues: 1 issue found
• 🟢 Security: all looks good
• 🟡 Testing: 5 issues found
• 🟢 Complexity: all looks good
• 🟢 Documentation: all looks good

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