Move the `objects` method to `LfsHelper` so that it is also available to `LfsStorageController`

It is needed for the `lfs_check_access!` callback when the repository size limit is enabled (EE only).
46 jobs for 24392-lfs-helper-refactor in 69 minutes and 12 seconds (queued for 18 seconds)
Status Job ID Name Coverage
  Prepare
passed #6096954
knapsack

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  Test
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bundler:check

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license_finder

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rubocop

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  Post Test
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coverage

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89.66%