Fix: Failing Unit Tests

[WyvernIXTL]

This PR addresses regressions stemming from the switch to sqlite from sled.

Added:

• Added specialized initialization errors for sqlite storage backend like in file storage backend prior.

Fixed:

• Fixed storage tests being abused to test sqlite storage backend.
• Fixed sqlite provider not creating necessary directories.
• Changed sqlite storage backend to use a connection pool to reenable multithreaded use of a provider.

Changed:

• Readded tests from file storage backend to sqlite storage backend.
• Default filter directive of test logs filters more logs. Dependencies only show error logs now.

Checklist:

• Do the unit tests in CAL run? Check at least those that you can run: cargo test -F software
• Are changes in common propagated to all providers that are currently in use?
  • software
  • tpm/android
  • tpm/apple_secure_enclave
• Did changes in the API occur, such that ./ts-types needs to be updated?
  • Generate types partially.
  • Have you given the maintainer of crypto-layer-node a heads up?
• Do the dart bindings have to be re-generated?
• Does the flutter plugin still compile?
• Do the integration tests in flutter-app still run?
• There are no build artifacts in the commit. (node_modules, lib, target and everything in .gitignore)

[Copilot]

Pull Request Overview

This PR fixes unit test failures that occurred after migrating from sled to SQLite as the storage backend. The changes address thread safety issues, directory creation problems, and improve error handling for the SQLite storage implementation.

• Migrated SQLite backend to use connection pooling for thread safety
• Added specialized initialization errors and directory creation for SQLite
• Updated test logging configuration to reduce noise from dependencies

Reviewed Changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/storage/storage_backend/sqlite_store.rs	Major refactor to use connection pooling, add proper error types, and include tests
src/storage/storage_backend/mod.rs	Update error type import and remove manual directory creation from tests
src/storage/mod.rs	Switch storage tests to use shared test store configuration
src/tests/mod.rs	Improve logging configuration with better error handling and default filters
Cargo.toml	Add r2d2 connection pooling dependencies and remove direct rusqlite dependency
cSpell.json	Add SQLite-related terms to spell checker dictionary