chore(deps): replace mgutz/ansi with termenv for terminal styling

Mikelrequested to merge
mikelolasagasti/glab-cli:drop-mgutz-ansi into main

Description

Removes the unmaintained mgutz/ansi dependency and replaces it with termenv, which is already used in the project.

Related Issues

Resolves #8270 (closed)

How has this been tested?

go test ./internal/iostreams/... and basic usage.

Edited by Mikel

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