feat(plugin-e2e): enable runtime e2e-selectors by default

[sunker]

What this PR does / why we need it:

This PR makes runtime e2e-selectors the default in @grafana/plugin-e2e, so tests resolve selectors from the Grafana under test rather than the bundled @grafana/e2e-selectors snapshot. It is a no-op against Grafana below 13.3.0, which still falls back to the bundled selectors.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

If plugin-e2e can't resolve selectors from grafana 13.3+ where runtime selectors should be build assets, it will log an error in CI before falling back to bundled selectors.

[pkg-pr-new]

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commit: ff52712