[BE] Remove unused conda-env-Linux-X64

[malfet]

Stack from ghstack (oldest at bottom):

• [CI][MacOS] Move more dependencies to pypi #154309
• [CI] Do not install libuv on MacOS #154307
• [BE] Do not templetize unnnecessarily #154305
• [BE] Sort requirements files alphabetically #154304
• -> [BE] Remove unused conda-env-Linux-X64 #154303

According to https://github.com/search?type=code&q=conda-env-++repo%3Apytorch%2Fpytorch it's not referenced anywhere and has been replaced with conda-env-ci a while ago

[pytorch-bot]

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[malfet]

@pytorchbot merge -f "It's an unused file"

[pytorchmergebot]

Merge started

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