Create plugin: CI workflow improvements

[sunker]

What this PR does / why we need it: This PR is making a few changes to the e2e related workflow bits:

• Use the right snippet in the article that walks through how to run e2e tests in ci
• Not doing a sparse checkout of the repo anymore in the e2e test job. Doing a sparse checkout have little benefits, and may cause confusion when contributors wants to go beyond the basic steps in the workflow. See this thread for example.
• Adds step that uploads Playwright report to GCS in case org is Grafana. Please note that even though someone were to falsely specify grafana as the org, this step would still not work for them as it requires access to id-tokens that are only available for repos within the grafana org.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

📦 Published PR as canary version: Canary Versions

:sparkles: Test out this PR locally via: ```bash npm install @grafana/create-plugin@4.7.1-canary.890.babb00f.0 npm install @grafana/plugin-e2e@1.1.2-canary.890.babb00f.0 # or yarn add @grafana/create-plugin@4.7.1-canary.890.babb00f.0 yarn add @grafana/plugin-e2e@1.1.2-canary.890.babb00f.0 ```

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[sunker]

Thanks for the review folks. Have removed the grafana specific bits and commented out the report uploading step (see this commit). Let me know what you think.

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

:rocket: PR was released in @grafana/create-plugin@4.10.6 :rocket: