nixos/nextcloud: Optionally disable setting HTTP response headers
nixos/nextcloud: Optionally disable setting HTTP response headers

This commit introduces a new option
`services.nextcloud.nginx.recommendedHttpHeaders` that can be used to
optionally disable serving recommended HTTP Response Headers in nginx.
This is especially useful if some headers are already configured
elsewhere to be served in nginx and thus result in duplicate headers.

Resolves #120223

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