Shorten editor tab file paths

[ianyong]

Description

When displaying file paths in the editor tab, show the shortest possible file path that uniquely identifies each tab among all open tabs. This is similar to how most code editors do it.

Part of #2176.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Code quality improvements

How to test

The multiple files mode is not yet ready for production and is disabled programmatically. Enable multiple files mode for testing by changing the condition to false:

frontend/src/pages/playground/Playground.tsx

Lines 603 to 615 in 9bc1140

	const toggleMultipleFilesModeButton = React.useMemo(() => {
	// TODO: Remove this once the multiple file mode is ready for production.
	if (true) {
	return <></>;
	}
	return (
	<ControlBarToggleMultipleFilesModeButton
	isMultipleFilesEnabled={isMultipleFilesEnabled}
	toggleMultipleFilesMode={() => dispatch(toggleMultipleFilesMode(workspaceLocation))}
	/>
	);
	}, [dispatch, isMultipleFilesEnabled, workspaceLocation]);

[coveralls]

Pull Request Test Coverage Report for Build 4508193665

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 18 of 21 (85.71%) changed or added relevant lines in 3 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+0.07%) to 34.881%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/commons/editor/tabs/EditorTabContainer.tsx	0	3	0.0%

Files with Coverage Reduction	New Missed Lines	%
src/commons/editor/tabs/EditorTabContainer.tsx	1	10.0%

Totals
Change from base Build 4508186654:	0.07%
Covered Lines:	4691
Relevant Lines:	12533

---

💛 - Coveralls

[zhaojj2209]

LGTM