Upgrade @typescript-eslint to v8 (from v6)

[rugpanov]

Why

Replaces Dependabot's #1955, which bumped only @typescript-eslint/eslint-plugin to ^8.62.1 and failed CI because (a) it left parser/utils at ^6 (version mismatch → "No candidates found"), and (b) 8.62.1 is an alpha — only 8.62.0 is a stable release.

typescript-eslint v8 supports the repo's existing ESLint 8 / legacy .eslintrc setup (peer eslint: ^8.57.0 || ^9 || ^10), so this is a self-contained upgrade — no flat-config migration required.

What

• Bump @typescript-eslint/{eslint-plugin,parser,utils} → ^8.62.0 (root + databricks-vscode package).
• Bump eslint ^8.55.0 → ^8.57.0 (v8's minimum peer; stays on ESLint 8, resolves to 8.57.1) across all three package.json files.
• Add @types/semver@^7.5.0 as an explicit devDependency — it was previously present only transitively via typescript-eslint v6; v8 no longer pulls it in, and whatsNewPopup.ts imports semver.
• Fix the 50 lint errors surfaced by v8's stricter defaults:
  • no-unused-vars (25): drop unused catch (e) bindings → bare catch {}.
  • no-require-imports (7): update stale no-var-requires disable directives to the renamed rule; convert import path = require("path") → import * as path.
  • no-unused-expressions (16): rewrite 3 x && x() short-circuits in source as if (x) { x(); }; disable the rule for test/integ files (chai fluent + conditional assertions inherently trip it).
  • no-empty-object-type (2): replace empty interface X extends TreeItem {} → type X = TreeItem.

Verification

• eslint src --ext ts passes (0 errors); yarn install --immutable passes; yarn run build passes.
• Resolved versions: plugin/parser 8.62.0, eslint 8.57.1.

Backward compatibility: dev/lint tooling + test-only assertion changes; no runtime, API, persisted-state, or config-format change to the shipped extension.

Closes #1955.

This pull request and its description were written by Isaac.

[rugpanov]

🤖 Integration tests triggered automatically for 478d5b13 via vscode-isolated-pr.yml.

Checks will be approved automatically on success.

[rugpanov]

Integration tests: https://github.com/databricks-eng/eng-dev-ecosystem/actions/runs/28653140957

TLDR: no regressions — 26 passing / 6 failing, matching the current e2e baseline. Zero Can't find view control "CONFIGURATION" (activation) failures, and none of the failures stem from the typescript-eslint v8 upgrade or the lint fixes (catch-binding, import, and if-block rewrites all behave correctly at runtime). The 6 reds are the known pre-existing environmental flakes (terraform-registry network, UC Item "access" not found, Login didn't finish, element click intercepted, ENOENT) that fail identically on main regardless of this change.

[github-actions]

If integration tests don't run automatically, an authorized user can run them manually by following the instructions below:

Trigger:
go/deco-tests-run/vscode

Inputs:

• PR number: 1956
• Commit SHA: cc8d0e8e76f723825ee5f67340c02511e633f86c

Checks will be approved automatically on success.