Detect trimmed changelogs and pick online instead

We only check the start of these lines to avoid hard coding the exact
command and we pick 150 as maximum line length as the longest package
name on my system is apparently 75 characters long. We could choose
longer or shorter without much issue as over-length just means we
mishandle the rest of the line as a new line and it should be really
unlikely that a) lines are that long in this file and b) that such long
lines contain one of our trigger sequences – but even if, all we do is
start a download of an online file. Could be worse.

This auto-detection can be avoided by setting
Acquire::Changelogs::AlwaysOnline (or Origin specific sub options)
to "true" if you always want the changelog from an online source.
The reverse – setting it to "false" in the hope it would not get the
changelog from an online source – was not and is still not possible.

Closes: #1024457

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