Remove unused project and image code

[zetter-rpf]

Related to https://github.com/RaspberryPiFoundation/digital-editor-issues/issues/1075

As part of https://github.com/RaspberryPiFoundation/digital-editor-issues/issues/1075 I was understanding how project loading works and noticed a set of API wrappers and image upload functionality that is not being used.

I think some of this was never used, and some of it has moved to the standalone app.

[zetter-rpf]

From @loiswells97 - #1171 depends on this, so we would need to bring this back in some form if we wanted to work on #1171

[Copilot]

Pull request overview

This PR removes unused project list/image upload API wrappers and associated UI, tests, styles, translations, and dependencies that are no longer used in the editor or have moved to the standalone app.

Changes:

• Removed unused API functions (getImage, readProjectList, uploadImages) and their tests, plus the loadProjectList thunk and updateImages reducer wiring.
• Deleted the ImageUploadButton component, its tests, styles, and i18n strings in all locales.
• Cleaned up now-unused dependencies (react-dropzone, parse-link-header and their transitive deps) from package.json and yarn.lock.

Reviewed changes

Copilot reviewed 12 out of 13 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
yarn.lock	Pruned lockfile entries for react-dropzone, parse-link-header, and their transitive dependencies to match the dependency removals.
src/utils/apiCallHandler.test.js	Updated API handler tests to stop referencing removed image/project list API helpers while keeping coverage for core project and error endpoints.
src/utils/apiCallHandler.js	Removed unused API wrappers (getImage, readProjectList, uploadImages) and simplified the exported handler object to only include still-used methods.
src/redux/EditorSlice.js	Dropped the unused loadProjectList thunk, parse-link-header import, and updateImages reducer/action export, while keeping other editor state behavior intact.
src/components/Editor/ImageUploadButton/ImageUploadButton.test.js	Deleted tests for the now-removed ImageUploadButton component.
src/components/Editor/ImageUploadButton/ImageUploadButton.jsx	Removed the ImageUploadButton component and its image-upload modal logic, which is no longer used.
src/assets/stylesheets/ImageUploadButton.scss	Deleted styling used exclusively by the removed image upload modal.
public/translations/xx-XX.json	Removed unused imageUploadButton translation block.
public/translations/fr-FR.json	Removed unused imageUploadButton translation block.
public/translations/es-LA.json	Removed unused imageUploadButton translation block.
public/translations/en.json	Removed unused imageUploadButton translation block.
public/translations/en-US.json	Removed unused imageUploadButton translation block.
package.json	Removed react-dropzone and parse-link-header from dependencies to reflect the deleted UI and API-list code.

Comments suppressed due to low confidence (1)

src/utils/apiCallHandler.js:100

• createError always includes error_type, project_id, and user_id keys in the POST body, even when those values are undefined, but the corresponding tests (and likely the API contract) expect only error for the basic case and to include the optional fields only when they are present. This mismatch will cause the axios mock expectations in apiCallHandler.test.js to fail and may send unexpected fields to the backend; consider constructing the payload object conditionally so that error_type, project_id, and user_id are only added when their values are defined, or adjust the tests and API expectations consistently.

  const createError = async (
    projectIdentifier,
    userId,
    error,
    sendError = false,
  ) => {
    if (!sendError) {
      return;
    }
    const { errorMessage, errorType } = error;
    return await post(`${host}/api/project_errors`, {
      error: errorMessage,
      error_type: errorType,
      project_id: projectIdentifier,
      user_id: userId,
    });
  };

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