ez: reimplement --resend

Instead of --resend just being a flag to add a RESEND prefix, allow us
to actually resend a previously sent series using the tag we have
applied and stored in sent/.

E.g. if we have previously sent a v2, thus automatically rerolling a v3,
we can resend a v2 again without needing to do anything else by using:

b4 send --resend v2

alternatively, we can use a full tag name:

b4 send --resend sent/some-series-topic-v2

Signed-off-by: Konstantin Ryabitsev <konstantin@linuxfoundation.org>

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