fix(account): update extension label and description on info pull

[Soner (shyim)]

Summary

• account producer extension info pull now writes the extension label and short description from the store back to composer.json (for platform plugins) and manifest.xml (for apps)
• This makes push and pull symmetric: push reads label/description from these files and sends them to the store, pull now writes them back
• Added UpdateMetaData method to the Extension interface with implementations for all three extension types
• Exported ExtensionMetadata and ExtensionTranslated types so they can be used from the account package

Fixes #929

Test plan

• Added unit test for UpdateMetaData on PlatformPlugin — verifies composer.json extra.label and extra.description are updated
• Added unit test for UpdateMetaData on App — verifies manifest.xml <label> and <description> elements are updated
• All existing tests pass
• Manual test: change extension name in Shopware Store, run shopware-cli account producer extension info pull, verify composer.json/manifest.xml is updated

[Copilot]

Pull request overview

This PR makes account producer extension info pull symmetric with info push by persisting store-provided label and short description back into the local extension source metadata files.

Changes:

• Exported extension metadata types and added UpdateMetaData(*ExtensionMetadata) to the extension.Extension interface.
• Implemented metadata updates for platform plugins (composer.json) and apps (manifest.xml) and wired the pull command to call it.
• Added unit tests covering metadata update persistence for platform plugins and apps.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
cmd/account/account_producer_extension_info_pull.go	Captures label/short description from store infos and calls UpdateMetaData after pulling.
internal/extension/root.go	Exports metadata types and extends the Extension interface with UpdateMetaData.
internal/extension/platform.go	Implements UpdateMetaData for platform plugins by updating composer.json extra.label/extra.description.
internal/extension/app.go	Implements UpdateMetaData for apps by updating <label>/<description> in manifest.xml.
internal/extension/bundle.go	Updates metadata type usage and provides a no-op UpdateMetaData implementation.
internal/extension/root_test.go	Adds new unit tests for plugin/app metadata update behavior.
internal/extension/extension_test.go	Updates the mock extension to satisfy the updated interface.

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