improve(E2E): add Quickpick title filter and visibility gate

[Dave Shoup (shouples)]

Summary of Changes

The Quickpick E2E page object always grabs the first .quick-input-widget on the page and leaves each caller to assert it's visible before typing or clicking into it. Only one quickpick renders at a time, so this mostly works, but it's fragile: a test can act on a quickpick that hasn't rendered yet (a source of intermittent E2E flakes), and there's no way to say which quickpick a step expects. ~35 call sites repeat their own toBeVisible() gate to work around this.

This PR makes two changes to tests/e2e/objects/quickInputs/Quickpick.ts:

• Adds an optional titlePattern?: string | RegExp constructor argument that filters the widget by its .quick-input-title, mirroring the sibling InputBox page object.
• Adds a waitForVisible() helper that confirm(), cancel(), and selectItemByText() call before interacting, moving the visibility gate into the page object instead of every call site.

titlePattern is optional, so all existing new Quickpick(page) call sites keep working unchanged.

Click-testing instructions

Not applicable (E2E test infrastructure with no user-facing behavior).

Optional: Any additional details or context that should be provided?

• npx gulp check, ESLint, and Prettier all pass on the changed file. The full Playwright E2E suite (which is what actually exercises this page object) needs Docker, the sidecar, and Electron, so it was not run on this branch; please run E2E before merging.
• Deliberately out of scope, as follow-ups: giving the sibling InputBox the same waitForVisible() gate for parity, and dropping the now-redundant manual toBeVisible() assertions from the call sites that no longer need them.

Closes #2740

Pull request checklist

Please check if your PR fulfills the following (if applicable):

Tests

• Added new
• Updated existing
• Deleted existing

Release notes

• Does anything in this PR need to be mentioned in the user-facing CHANGELOG?

[Copilot]

Pull request overview

Improves the Quickpick E2E page object with title-based filtering and centralized visibility waits.

Changes:

• Adds optional titlePattern filtering.
• Adds waitForVisible() before interactions.
• Preserves existing constructor compatibility.

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Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
No data about Duplication

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