[FEATURE]: buildtest report summary --color to specify color dynamically

[shahzebsiddiqui]

Please describe your feature request

Let's add an option to dynamically change the color via buildtest report summary --color=<color>.

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[shahzebsiddiqui]

(buildtest) spack@9bcd424acde5:~/buildtest$ python -c "from rich.color import ANSI_COLOR_NAMES; print(list(ANSI_COLOR_NAMES.keys()))"
['black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white', 'bright_black', 'bright_red', 'bright_green', 'bright_yellow', 'bright_blue', 'bright_magenta', 'bright_cyan', 'bright_white', 'grey0', 'gray0', 'navy_blue', 'dark_blue', 'blue3', 'blue1', 'dark_green', 'deep_sky_blue4', 'dodger_blue3', 'dodger_blue2', 'green4', 'spring_green4', 'turquoise4', 'deep_sky_blue3', 'dodger_blue1', 'green3', 'spring_green3', 'dark_cyan', 'light_sea_green', 'deep_sky_blue2', 'deep_sky_blue1', 'spring_green2', 'cyan3', 'dark_turquoise', 'turquoise2', 'green1', 'spring_green1', 'medium_spring_green', 'cyan2', 'cyan1', 'dark_red', 'deep_pink4', 'purple4', 'purple3', 'blue_violet', 'orange4', 'grey37', 'gray37', 'medium_purple4', 'slate_blue3', 'royal_blue1', 'chartreuse4', 'dark_sea_green4', 'pale_turquoise4', 'steel_blue', 'steel_blue3', 'cornflower_blue', 'chartreuse3', 'cadet_blue', 'sky_blue3', 'steel_blue1', 'pale_green3', 'sea_green3', 'aquamarine3', 'medium_turquoise', 'chartreuse2', 'sea_green2', 'sea_green1', 'aquamarine1', 'dark_slate_gray2', 'dark_magenta', 'dark_violet', 'purple', 'light_pink4', 'plum4', 'medium_purple3', 'slate_blue1', 'yellow4', 'wheat4', 'grey53', 'gray53', 'light_slate_grey', 'light_slate_gray', 'medium_purple', 'light_slate_blue', 'dark_olive_green3', 'dark_sea_green', 'light_sky_blue3', 'sky_blue2', 'dark_sea_green3', 'dark_slate_gray3', 'sky_blue1', 'chartreuse1', 'light_green', 'pale_green1', 'dark_slate_gray1', 'red3', 'medium_violet_red', 'magenta3', 'dark_orange3', 'indian_red', 'hot_pink3', 'medium_orchid3', 'medium_orchid', 'medium_purple2', 'dark_goldenrod', 'light_salmon3', 'rosy_brown', 'grey63', 'gray63', 'medium_purple1', 'gold3', 'dark_khaki', 'navajo_white3', 'grey69', 'gray69', 'light_steel_blue3', 'light_steel_blue', 'yellow3', 'dark_sea_green2', 'light_cyan3', 'light_sky_blue1', 'green_yellow', 'dark_olive_green2', 'dark_sea_green1', 'pale_turquoise1', 'deep_pink3', 'magenta2', 'hot_pink2', 'orchid', 'medium_orchid1', 'orange3', 'light_pink3', 'pink3', 'plum3', 'violet', 'light_goldenrod3', 'tan', 'misty_rose3', 'thistle3', 'plum2', 'khaki3', 'light_goldenrod2', 'light_yellow3', 'grey84', 'gray84', 'light_steel_blue1', 'yellow2', 'dark_olive_green1', 'honeydew2', 'light_cyan1', 'red1', 'deep_pink2', 'deep_pink1', 'magenta1', 'orange_red1', 'indian_red1', 'hot_pink', 'dark_orange', 'salmon1', 'light_coral', 'pale_violet_red1', 'orchid2', 'orchid1', 'orange1', 'sandy_brown', 'light_salmon1', 'light_pink1', 'pink1', 'plum1', 'gold1', 'navajo_white1', 'misty_rose1', 'thistle1', 'yellow1', 'light_goldenrod1', 'khaki1', 'wheat1', 'cornsilk1', 'grey100', 'gray100', 'grey3', 'gray3', 'grey7', 'gray7', 'grey11', 'gray11', 'grey15', 'gray15', 'grey19', 'gray19', 'grey23', 'gray23', 'grey27', 'gray27', 'grey30', 'gray30', 'grey35', 'gray35', 'grey39', 'gray39', 'grey42', 'gray42', 'grey46', 'gray46', 'grey50', 'gray50', 'grey54', 'gray54', 'grey58', 'gray58', 'grey62', 'gray62', 'grey66', 'gray66', 'grey70', 'gray70', 'grey74', 'gray74', 'grey78', 'gray78', 'grey82', 'gray82', 'grey85', 'gray85', 'grey89', 'gray89', 'grey93', 'gray93']