Fixes #61354

* snippets: Add setInterval snippet

* fix: typo in prefix

Fixes #61333

fixed documentation typo: 'guardeed' -> 'guaranteed'

whether instead of wheter

guaranteed instead of guardeed

Corrected typo in comments

Prevent terminal task system from trying to set a non-existent terminal as active
Updated terminal dispose parameter to be named immediate and used immediate parameter in terminal kill actions
Fixes #60858

Fix strict null errors in problemMatcher.ts
Fixes #61090

Fixes #58371

fixing simple cases of any[]