[v3-1-test] Detect interactive terminal to set colored logging + support override env variables (#56132) #56157
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After #55824, colored logs were being emitted even when the terminal was
not interactive, causing failures. Environment variables to force color
to be turned on or off were also not being respected.
This resolves those issues and adds unit tests with all combinations of
factors to determine if logs should be colored.
(cherry picked from commit d08c2d2)
Co-authored-by: Ramit Kataria ramitkat@amazon.com