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Remove beta ecosystem flag handling for Deno (#15173)

Deno is now GA, so remove the allow_beta_ecosystems? gate from
FileFetcher#fetch_files and the corresponding test stub.

Co-authored-by: Mark Allen <markhallen@github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
M
Mark Allen committed
ef8cfaec84f06ef5a2bf3c4847f4af72f5d747bc
Parent: 52e531b
Committed by GitHub <noreply@github.com> on 5/29/2026, 1:17:17 PM