e2eTesting: update selectors

[L-M-K-B]

An external contributor updated some e2e selectors which are duplicated in this repo. In order to fix playwright tests in their PR in grafana/grafana I updated the selectors here.

Related to https://github.com/grafana/grafana/pull/78536

📦 Published PR as canary version: Canary Versions

:sparkles: Test out this PR locally via: ```bash npm install @grafana/plugin-e2e@1.1.1-canary.874.63ebb8f.0 # or yarn add @grafana/plugin-e2e@1.1.1-canary.874.63ebb8f.0 ```

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[L-M-K-B]

All E2E tests are failing (e.g. this one). Is this happening because the selectors deviate from grafana/grafana main branch or do I have to fix anything in this repo? @sunker and @leventebalogh

[grafana-plugins-platform-bot[bot]]

:rocket: PR was released in @grafana/create-plugin@4.8.0, @grafana/plugin-e2e@1.2.0 :rocket: