BOLT-1048: Add third pair of OpenADR XML codec tests (oadrPoll + oadrResponse)

Artem asked in Slack thread 1780036222.881059 / msg 1780293484.235999 for two more tests on different files from BOLT-1048-OpenADR-XML-codec--parser-builder (PR #11143). Already covered: oadrCreatedEvent (PR #11208 closed), oadrDistributeEvent (PR #11208 closed), oadrCreatePartyRegistration + oadrCreatedPartyRegistration (PR #11304 merged). New scope: builders/oadrPoll.ts and parsers/oadrResponse.ts. Branch: artem-agent/bolt-1048-openadr-tests-3.