Fix embedded HTML template expression idempotency - #19722

Description

Fixes #19518.

Embedded HTML template expressions were aligned to their indentation in the original source even though the HTML printer can move the interpolation. Multiline JavaScript inside a moved interpolation therefore used stale absolute indentation and needed another Prettier pass to stabilize.

This change lets embedded HTML control expression indentation while preserving the existing source-alignment behavior for regular, CSS, GraphQL, and Markdown template literals. Regression coverage includes the reported nested .map()/ternary case and JavaScript embedded in a <pre> element.

Validation:

• FULL_TEST=1 yarn jest tests/format/js/multiparser-html --runInBand
• yarn eslint src/language-js/embed/html.js src/language-js/print/template-literal.js tests/format/js/multiparser-html/html-template-literals.js
• yarn prettier src/language-js/embed/html.js src/language-js/print/template-literal.js tests/format/js/multiparser-html/html-template-literals.js tests/format/js/multiparser-html/__snapshots__/format.test.js.snap --check
• yarn lint:format-test
• yarn lint:typecheck
• git diff --check

Checklist

• I’ve added tests to confirm my change works.
• (If changing the API or CLI) I’ve documented the changes I’ve made (in the docs/ directory).
• (If the change is user-facing) I’ve added my changes to changelog_unreleased/*/XXXX.md file following changelog_unreleased/TEMPLATE.md.
• I’ve read the contributing guidelines.
• I did not use AI to generate this PR.
• (If the above is not checked) I have reviewed the AI-generated content before submitting.