Remove Gitlab::GithubImport::RefreshImportJidWorker

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!142980 (merged) moved Gitlab::GithubImport::RefreshImportJidWorker to a more generic namespace now that it's used by Bitbucket importers: Gitlab::Import::RefreshImportJidWorker. However, the old worker was left in place and simply enqueued the renamed worker, effectively making it a no-op per our documentation on removing workers.

Once the initial MR is merged to production and Gitlab::Import::RefreshImportJidWorker is successfully being enqueued, Gitlab::GithubImport::RefreshImportJidWorker and its specs can safely be removed.