Add workbench.editor.tabHoverInformation to customize editor tab hover

[Jeeva M (jeeva-m-21)]

Fixes #163166

Adds workbench.editor.tabHoverInformation, which controls the information shown when hovering over an editor tab:

• short: the name of the file
• long (default): the absolute path of the file — exactly what is shown today
• detail: the name of the file on the first line and its absolute path on the second line

The values come straight from the issue body. long is the default, so the current behaviour is unchanged for anyone who does not set the option.

The colour half of the request is already available through the existing tab.hoverBackground / tab.hoverForeground colors, so this only covers the information part.

Implementation notes

• getHoverTitle() in editorTabsControl.ts used to hardcode Verbosity.LONG. It now resolves the verbosity from the new option via a small getHoverTitleText() helper: Verbosity.SHORT is the file name and Verbosity.LONG is the absolute path, so short and long need no new label logic.
• detail builds name + '\n' + path. MarkdownString.appendText() turns the \n into a paragraph break and escapes markdown tokens, so a single string produces both the markdown hover and the markdownNotSupportedFallback. Preview tabs keep their existing (_preview_ …) decoration in every mode.
• The option reaches IEditorPartOptions through the existing generic Object.assign(options, config.workbench.editor) in getEditorPartOptions().
• Both tab controls redraw when the option changes, mirroring what workbench.editor.labelFormat already does, so the setting applies to already-open tabs without a reload.

Verification

• 4 new unit tests in multiEditorTabsControl.test.ts (default, short, detail, and preview-tab decoration).
• npm run test-browser-no-install -- --browser chromium → 28271 passing, 133 pending, 2 failing; both failures reproduce on a clean tree and are unrelated (AutomationsCardsWidget, ChatStatusDashboard).
• MultiEditorTabsControl suite: 26 passing, 0 failing.
• tsc --project ./src/tsconfig.json --noEmit --skipLibCheck, npm run valid-layers-check and eslint on the changed files are all clean.
• Only Chromium was run locally (Firefox/WebKit builds not installed); CI covers the rest.

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[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

Benjamin Christopher Simmonds (@benibenj)

Matched files:

• src/vs/workbench/browser/parts/editor/editor.ts
• src/vs/workbench/browser/parts/editor/editorTabsControl.ts
• src/vs/workbench/browser/parts/editor/multiEditorTabsControl.ts
• src/vs/workbench/browser/parts/editor/singleEditorTabsControl.ts

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