Use as unknown for unimportant as any cases in tests

[Tyriar]

Part of #269213

[Copilot]

Pull Request Overview

This PR refactors type assertions in terminal test files to use safer TypeScript casting patterns. The changes replace the discouraged as any casts with as unknown as Type assertions, which provides better type safety by requiring an explicit intermediate cast. Additionally, the PR leverages the satisfies operator to ensure partial objects conform to expected types before casting, and removes now-unnecessary eslint-disable comments.

Key Changes

• Replaces as any type assertions with as unknown as Type for improved type safety
• Introduces satisfies Partial<Type> before casting to validate partial object shapes
• Removes eslint-disable-next-line local/code-no-any-casts comments throughout test files

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
xtermTerminal.test.ts	Adds constructor to TestWebglAddon, updates type casts for addon importer and view descriptor
shellIntegrationAddon.integrationTest.ts	Converts event array casts and terminal config cast to use as unknown pattern, adds type import
terminalService.test.ts	Updates all terminal instance partial objects to use satisfies with as unknown pattern, adds type import
terminalProfileService.integrationTest.ts	Refactors backend/environment service mocks to use satisfies pattern, removes unused variable, updates config event casts
terminalProcessManager.test.ts	Updates backend service mock to use async/proper typing, fixes config event cast, adds type imports
terminalInstance.test.ts	Makes getBackend async, properly types createProcess parameters, adds type imports, fixes capability cast
terminalCapabilityStore.test.ts	Converts all capability addition casts to typed as unknown pattern, adds capability type imports