i18n(ja): add framework-components.mdx and update markdoc.mdx

[morinokami]

Description (required)

• Translate framework-components.mdx into Japanese.
• Update markdoc.mdx.
  • I updated it at the same time because the link in markdoc.mdx needed to be corrected
  • diff
    • fix(integrations-guide): add/format API references blocks #12319
    • fix(integrations-guide/markdoc): add missing import in code snippets #12893

Related issues & labels (optional)

• Suggested label: i18n

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Tracked Files

File	Note
ja/basics/astro-components.mdx	Localization changed, will be marked as complete.
ja/guides/framework-components.mdx	Localization added, will be marked as complete.
ja/guides/integrations-guide/markdoc.mdx	Localization changed, will be marked as complete.
ja/guides/integrations-guide/mdx.mdx	Localization changed, will be marked as complete.
ja/guides/integrations-guide/react.mdx	Localization changed, will be marked as complete.
ja/reference/astro-syntax.mdx	Localization changed, will be marked as complete.
ja/reference/errors/no-client-entrypoint.mdx	Localization changed, will be marked as complete.
ja/tutorial/6-islands/1.mdx	Localization changed, will be marked as complete.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[sarah11918]

This PR has a bunch of pages that will have changes in v6. I wonder whether it's better to make these updates, along with the necessary v6 updates, to the v6 branch only (or at least, along with a second PR to v6) so that these won't all be immediately outdated upon release?