[Dotenv] load .env.dist when it exists and .env is not found #29171
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As illustrated in #29170, it can be useful to opt out from the
.env
convention and fall back to defining env vars in.env.dist
instead. This PR allows that by loading.env.dist
when it exists and.env
is not found.Needs symfony/flex#434 to work seamlessly when using Flex.