fix(plugin-e2e): don't assume panel options group is expanded by default

[sunker]

What this PR does / why we need it:

The nightly E2E workflow failed against Grafana's nightly image: grafana/grafana@5f1776a28c changed panel options categories to collapse by default when they have zero items, breaking panelEdit.spec.ts's "Data links" group tests. Fixes the tests to force expand/collapse state instead of assuming a default, and fixes getDataLinksOptions() to resolve the label per Grafana version.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Broken nightly run: https://github.com/grafana/plugin-tools/actions/runs/33056766956

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commit: b7a0e93

[mckn]

LGTM!