Set TargetRailsVersion of RuboCop to 8.0 (#43205).
Fix wrong RuboCop's cop name (#43437).
Update RuboCop Rails to 2.33 (#43438).
Fix RuboCop Rails/OrderArguments (#43438).
Update RuboCop to 1.81 (#43437).
Regenerate .rubocop_todo.yml (#43437).
Fix RuboCop Layout/BeginEndAlignment (#43437).
Fix RuboCop Style/RedundantRegexpCharacterClass (#43437).
Fix RuboCop Style/RedundantRegexpEscape (#43437).
Merged r24112 from trunk to 6.1-stable (#43409).
Fix a test failure in the Gantt chart context menu caused by unintended button clicks (#43397).
Patch by Katsuya HIDAKA (Katsuya HIDAKA).
Merged r24116 from trunk to 6.1-stable (#43379).
Update Japanese translations for alert titles in CommonMark Markdown help (#43379).
Merged r24114 from trunk to 6.1-stable (#43425).
Reorder alerts by severity in CommonMark Markdown help (#43425).
Add copyright headers to webhook-related files (#29664).
Progress bar custom field shows only "%" instead of "0%" when value is nil (#43409).
Patch by Nishida Yuya (Nishida Yuya).
Merged r24107 from trunk to 6.1-stable (#43420).
Fix Gantt system test to correctly verify context menu open/close behavior (#43397).
Fix Gantt context menu system test flakiness (#43397).
Use require_relative to load test_helper so that tests can be run with the ruby command (#29664).
Markdown alerts are missing styling in email notifications (#43420).
Patch by Go MAEDA (Go MAEDA).
Adjust Markdown alert colors for 6.1-stable: use standard orange/yellow for "Warning" and "Caution" (#43425).
Use orange for Markdown "Warning" alerts and yellow for "Caution" to align with common standards (#43425).
Fixes Layout/EmptyLinesAroundClassBody (#43379).
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