http2: improve handling of lost PING in Server

[Choraden]

This addresses inconsistencies in handling lost PINGs
between Server and Transport by:

1. Always logging a message for lost PINGs, regardless of verbose mode.
2. Invoking CountError with the conn_close_lost_ping error key.

Fixes golang/go#69963

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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Patch Set 1:

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[HarishH-DELL]

LGTM

[gopherbot]

Message from Hubert Grochowski:

Patch Set 3:

(1 comment)

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