fix: execute sole static script tag

[dummdidumm]

• take into account that template could consist of a single script tag, for which querySelectorAll('script') would yield false negatives
• add test to ensure that we don't execute script tags inside @html tags next to static script tags

fixes #11082

Had to move one test because jsdom does wrongfully eagerly execute scripts, which the browser does not do when it's inserted like we do.
Should be merged after #11099 because it likely needs to move the test in there to the runtime-browser-suite, too.

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests and linting

• Run the tests with pnpm test and lint the project with pnpm lint

[changeset-bot]

🦋 Changeset detected

Latest commit: bc7e127

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
svelte	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR