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Fix(helpers): Support Gerrit 3.x compact change-id

Gerrit 3.x and later pass the hook --change argument in a new
compact form: '<URL-encoded project>~<change_number>' (e.g.
'ccsdk%2Fapps~1') rather than the legacy triplet
'project~branch~Iabc123...'.  The previous get_change_id regex
only matched the legacy triplet and crashed with:

    IndexError: list index out of range

on every patchset-created, comment-added and change-merged event
served by a Gerrit 3.x instance, dropping every event before the
workflow dispatch could run.

A diagnostic capture from a CI deployment of Gerrit 3.13.1
showed every hook firing the same traceback at helpers.py:311
with --change='ccsdk%2Fapps~1', confirming the regex mismatch.

Behaviour for the legacy triplet is preserved: when the input
matches '<project>~<branch>~I<hex>', the function still returns
the I... Change-Id from the commit message footer.  When the
input matches the new compact shape '<project>~<digits>', the
function returns it verbatim.  The compact form is still a
unique, stable identifier per change and works as a
GERRIT_CHANGE_ID workflow input (e.g. for concurrency keys),
which is what almost every downstream Gerrit-style workflow
uses it for.

Unrecognised input now raises ValueError with a clear message
instead of IndexError, so future hook tracebacks point at the
mismatch directly rather than at re.findall(...)[0].

Tests cover both shapes plus the rejection path.

Co-authored-by: Claude <claude@anthropic.com>
Change-Id: Ibea897330
Signed-off-by: Matthew Watkins <mwatkins@linuxfoundation.org>

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