MAINT Consolidate image URL download handling

[nightcityblade]

Description

Consolidates the duplicated asynchronous image URL downloader into one converter-internal helper while retaining the existing delegating methods. This preserves subclass overrides, patch points, byte-return behavior, aiohttp error wrapping, and cancellation propagation.

Closes #2417.

Tests and Documentation

• uv run pytest -q tests/unit/converter/test_image_compression_converter.py tests/unit/converter/test_image_color_saturation_converter.py tests/unit/converter/test_image_resizing_converter.py tests/unit/converter/test_image_rotation_converter.py — 71 passed
• uv run pre-commit run --files pyrit/converter/base_image_to_image_converter.py pyrit/converter/image_compression_converter.py tests/unit/converter/test_image_compression_converter.py — all applicable hooks passed, including Ruff, ty, and async-suffix checks
• Documentation: N/A; this is an internal behavior-preserving maintenance change.
• JupyText: N/A; no notebooks or documentation examples changed.

[Roman Lutz (romanlutz)]

Looks great, but we can't merge unless you accept the CLA.

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[nightcityblade]

I added focused coverage for both converter wrapper methods in 7f3de9e, bringing the changed download paths to full diff coverage. Validation: all 25 tests in test_image_compression_converter.py passed; Ruff check/format and git diff --check passed. The remaining merge gate is the CLA, which requires the account holder to review and accept.

[Roman Lutz (romanlutz)]

Looks great, but we can't merge unless you accept the CLA.

nightcityblade 👆