Simplify saved track pagination

[JPrier]

Motivation

• Address an inline comment by simplifying the pagination loop in current_user_saved_tracks so the loop exits when the time cutoff or max_items is reached instead of embedding complex conditions per-page.

Description

• Replace the previous paginated-collection loop with a simpler while resp.get("next"): loop that first checks len(tracks) >= max_items or reached_cutoff and breaks, keeping the same collection semantics via the existing _collect_saved_tracks helper in spotifyActionService/src/accessor/spotifyAccessor.py.
• Commit message and diff reflect only the pagination simplification in current_user_saved_tracks (no behavioral API changes beyond the loop structure).

Testing

• Ran linter with uvx ruff check --exit-zero . and it passed.
• Ran the full test suite with PYTHONPATH=$PWD/spotifyActionService/src uv run --extra dev python -m coverage run --source=$PWD/spotifyActionService/src -m pytest and all tests passed (73 passed, 1 deselected).
• Generated coverage output with uv run --extra dev coverage html and uv run --extra dev coverage report, resulting in overall coverage around 97%.

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Codex Task