fix: React 19 / Grafana 13 compatibility

[jackw]

Summary

• Bumps @grafana/plugin-ui from 0.12.1 to 0.13.1, which resolves the bundled react/jsx-runtime issue detected by @grafana/react-detect (jsxRuntimeImport pattern)
• Pins the e2e-version CI action to v1.2.1 and opts in to the React 19 Grafana preview image in the E2E matrix

You can find more information about this in our blog post here.

Verification

@grafana/react-detect reports 0 issues after the dependency bump:

"totalIssues": 0, "status": "no_action_required"

Test plan

• CI E2E matrix runs against both React 18 and React 19 Grafana preview images
• Build passes (npm run build)

🤖 Generated with Claude Code

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​@​grafana/​plugin-ui@​0.12.1 ⏵ 0.13.1	+1		-1	-4

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[jackw]

@cap10morgan I'm sorry to ping you but I would appreciate you taking a look at this PR. Grafana is planning to move to React 19 and your plugin was marked as incompatible due to the version of @grafana/plugin-ui it uses. By bumping the dep to latest version fixes the issues. I've also included the react-19 dev image in the CI e2e matrix.