Adjust extend_es_archiver to handle additional cases

[pheyos]

Summary

This PR enables the extend_es_archiver to recognize additional indices like .kibana_1 as well as a list of indices.

Details

During functional tests, there are cases where the Kibana default settings are not applied correctly after loading an esArchive. This happens when the archive works on a .kibana_<N> index. As a result e.g. the timezone is not set to UTC any more, which can make tests fail in case the server and client are in different time zones (happens on some cloud tests depending on cloud region).
Also, the esArchiver stats output can contain a list of indices as a key, here's one example of the stats when loading lens/basic, that's not triggering the update to default settings:

{
    '.kibana_2,.kibana_1': {
        skipped: false,
        deleted: true,
        created: false,
        archived: false,
        waitForSnapshot: 0,
        configDocs: { upgraded: 0, tagged: 0, upToDate: 0 },
        docs: { indexed: 0, archived: 0 },
    },
    '.kibana_1': {
        skipped: false,
        deleted: false,
        created: true,
        archived: false,
        waitForSnapshot: 0,
        configDocs: { upgraded: 0, tagged: 0, upToDate: 0 },
        docs: { indexed: 11, archived: 0 },
    },
};

[spalger]

LGTM

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 61034c9

Metrics [docs]

✅ unchanged

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