Fix warning when running theme commands in valid theme directories

[karreiro]

WHY are these changes introduced?

Fix warning when running theme commands in valid theme directories.

WHAT is this pull request doing?

Updating the list of required directories.

Post-release steps

N/A

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes
• I've considered analytics changes to measure impact
• The change is user-facing — I've identified the correct bump type (patch for bug fixes · minor for new features · major for breaking changes) and added a changeset with pnpm changeset add

[Copilot]

Pull request overview

This PR adjusts the heuristic used by the theme CLI to decide whether a working directory “looks like” a theme directory, to avoid showing a warning when running theme commands in certain valid theme setups.

Changes:

• Loosen hasRequiredThemeDirectories by removing sections from the required directory list.
• Add a unit test covering the relaxed “minimum required directories” behavior.
• Add a patch changeset for @shopify/theme.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
packages/theme/src/cli/utilities/theme-fs.ts	Updates the directory heuristic for detecting theme directories.
packages/theme/src/cli/utilities/theme-fs.test.ts	Adds test coverage for the updated heuristic.
.changeset/fix-theme-directory-warning.md	Adds a patch changeset documenting the user-facing warning fix.

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[isaacroldan]

No need for changeset here, since it is already included in the other branch, we don't want to show it again in the next minor.