ipaddress: IPv6Address.reverse_pointer produces an invalid name for an address with a scope id

Bug report

Since gh-88178 (a2104b7ce), :attr:~ipaddress.IPv6Address.exploded includes
the %scope_id suffix. IPv6Address._reverse_pointer derives the pointer
from self.exploded and only strips :, so the scope id is reversed into
the name:

>>> import ipaddress
>>> ipaddress.IPv6Address('fe80::1%eth0').reverse_pointer
'0.h.t.e.%.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa'

A scope id is link-local and is not part of the address, so it must not appear
in the reverse DNS name. The correct value is the one for fe80::1:

>>> ipaddress.IPv6Address('fe80::1').reverse_pointer
'1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa'

Before a2104b7ce this raised :exc:~ipaddress.AddressValueError; it now returns
a malformed name silently.

Linked PRs

• gh-155837

从 ipaddress.IPv6Address._reverse_pointer 和本报告中的 reverse_pointer 示例开始。检查 scope_id 后缀如何进入 IPv6Address.exploded，并验证 fe80::1%eth0 的反向 DNS 名称是否与不带后缀的地址匹配。完成的标准是生成的指针中不包含作用域标识符，并且之前格式错误的输出由回归测试覆盖。