FirewallContext is used by networkd and nspawn. Both allocates the context when it is really necessary. Hence, it is not necessary to delay probing backend. Moreover, if iptables backend is not enabled on build, and nftables is not supported by kernel, previously `fw_nftables_init()` is called everytime when we try to configure masquerade or dnat. It causes significant performance loss. Fixes test-firewall-util issue in #19052.
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