Support node 22

[sunker]

What this PR does / why we need it:

Node 22 is now LTS. This PR adds support for Node 22 in plugin-e2e (and removes the upper bound) and changes the node engine in scaffolded plugins to 22. Also changing all workflows (local and scaffolded) to use 22.

We'll remove support for node 18 entirely once it's moved out of maintenance LTS.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Will add a follow up PR that bumps node version in the examples repo.

📦 Published PR as canary version: Canary Versions

:sparkles: Test out this PR locally via: ```bash npm install @grafana/create-plugin@5.9.0-canary.1298.08bf9c9.0 npm install @grafana/plugin-e2e@1.12.0-canary.1298.08bf9c9.0 # or yarn add @grafana/create-plugin@5.9.0-canary.1298.08bf9c9.0 yarn add @grafana/plugin-e2e@1.12.0-canary.1298.08bf9c9.0 ```

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[tolzhabayev]

Some interesting things in node 22:

• https://github.com/nodejs/node/blob/main/doc/changelogs/CHANGELOG_V22.md#node---run-is-now-stable (might be faster than npm run)
• https://github.com/nodejs/node/pull/52074 (node --watch is stable)
• https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/fromAsync
• https://github.com/grafana/plugin-tools/blob/4d8c1149c676d9cb2d655eb022e01abcf7b9fe56/packages/create-plugin/src/utils/utils.templates.ts#L2 can probably be replaced with fs.glob

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

:rocket: PR was released in @grafana/create-plugin@5.9.0, @grafana/plugin-e2e@1.12.0, website@3.5.0 :rocket: