Render error page on theme asset upload error

[jamesmengo]

WHY are these changes introduced?

Fixes #0000

WHAT is this pull request doing?

How to test your changes?

Post-release steps

Measuring impact

How do we know this change was effective? Please choose one:

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[jamesmengo]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• Render error page on theme asset upload error #5221 👈 (View in Graphite)
• [Themes] Store and track theme asset upload errors during theme dev #5220
• main

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.23% (-0.02% 🔻)	8871/11792
🟡	Branches	70.42% (-0.02% 🔻)	4325/6142
🟡	Functions	75.03% (-0.02% 🔻)	2323/3096
🟡	Lines	75.79% (-0.02% 🔻)	8387/11066

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / ConcurrentOutput.tsx	98.36% (-1.64% 🔻)	88% (-4% 🔻)	100%	98.33% (-1.67% 🔻)

Test suite run success

2000 tests passing in 904 suites.

Report generated by 🧪jest coverage report action from d7665cd

[github-actions]

Differences in type declarations

We detected differences in the type declarations generated by Typescript for this branch compared to the baseline ('main' branch). Please, review them to ensure they are backward-compatible. Here are some important things to keep in mind:

• Some seemingly private modules might be re-exported through public modules.
• If the branch is behind main you might see odd diffs, rebase main into this branch.

New type declarations

We found no new type declarations in this PR

Existing type declarations

packages/cli-kit/dist/public/node/themes/types.d.ts

@@ -92,6 +92,10 @@ export interface ThemeFileSystem extends VirtualFileSystem {
     applyIgnoreFilters: <T extends {
         key: string;
     }>(files: T[]) => T[];
+    /**
+     * Stores upload errors returned when uploading files via the Asset API
+     */
+    uploadErrors: Map<Key, string[]>;
 }
 /**
  * Represents a theme on the file system.