fix(config): Mark three unused config.yml options as deprecated

[waterWang]

Description

Three options in config.yml are never read anywhere in the repository — not in Python, not in the React UI, not in the Helm chart, not in the docs:

config.yml	option	added	references outside config.yml
line 1140	[logging] color_log_error_keywords	2.10.0	0
line 1148	[logging] color_log_warning_keywords	2.10.0	0
line 2737	[scheduler] ignore_first_depends_on_past_by_default	2.3.0	0

None of the three carried version_deprecated or deprecation_reason, so they were presented as current settings in config.yml (which drives both the generated airflow.cfg and the configuration reference). Someone reading the docs sets one of these and nothing happens, with no warning.

Fix

Add version_deprecated: 3.4.0 and deprecation_reason: This parameter is no longer used. to all three options, following the existing pattern used by e.g. [traces] otel_debug_traces_on.

Closes #71259

[kaxil]

Closing this as part of a cleanup of a large batch of PRs opened in quick succession from this account.

18 PRs have been opened here in the past two weeks and none have merged. Several show signs of being generated and submitted without review: #71432 and #71433 are the same change across the same five files, opened two minutes apart, and several titles carry a leaked agent identifier that other contributors already flagged as garbled text on #70629 and #71322.

Airflow is maintained by volunteers. Every PR costs reviewer time and CI capacity, so a high volume of unvetted submissions has a real cost to the project.

You are welcome to keep contributing. Please open one change at a time, run it locally against the tests, and read the contributors' guide before submitting. If you think a specific change here is correct, comment with the reasoning and a maintainer can reopen it.