Merge branch 'jk/ui-color-always-to-auto-maint' (early part) into jk/ref-filter-colors-fix-maint

* 'jk/ui-color-always-to-auto-maint' (early part): color: make "always" the same as "auto" in config provide --color option for all ref-filter users t3205: use --color instead of color.branch=always t3203: drop "always" color test t6006: drop "always" color config tests t7502: use diff.noprefix for --verbose test t7508: use test_terminal for color output t3701: use test-terminal to collect color output t4015: prefer --color to -c color.diff=always test-terminal: set TERM=vt100