Update ProcessResourceDetector to not set full cli arg attrs by default

[pmcollins]

Description

Stops ProcessResourceDetector from collecting or emitting process.command_args and process.command_line by default. These attributes can contain sensitive command-line values and are opt-in in the spec.

This PR adds opt-in with ProcessResourceDetector(include_command_args=True) for users who need the current full command behavior. Auto-instrumentation/declarative config opt-in can be added separately once a config approach is agreed on.

Fixes #5358

Type of change

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

• uv run --with pytest==7.4.4 --with psutil==7.2.2 --with flaky==3.7.0 pytest opentelemetry-sdk/tests/resources/test_resources.py -k process_detector
• uv run ruff check opentelemetry-sdk/src/opentelemetry/sdk/resources/__init__.py opentelemetry-sdk/tests/resources/test_resources.py
• uv run ruff format --check opentelemetry-sdk/src/opentelemetry/sdk/resources/__init__.py opentelemetry-sdk/tests/resources/test_resources.py

Does This PR Require a Contrib Repo Change?

• No.

Checklist:

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated