When an ACL source list contains a wildcard (*) alongside explicit
sources (tags, groups, hosts, etc.), Tailscale preserves the individual
IPs from non-wildcard sources in SrcIPs alongside the merged wildcard
CGNAT ranges. Previously, headscale's IPSetBuilder would merge all
sources into a single set, absorbing the explicit IPs into the wildcard
range.
Track non-wildcard resolved addresses separately during source
resolution, then append their individual IP strings to the output
when a wildcard is also present. This fixes the remaining 5 ACL
compat test failures (K01 and M06 subtests).
Updates #2180
ebe0f4078d