MPP-3894: Downgrade Typescript to 5.4.x

[jwhitlock]

We're getting an error in CircleCI, and @groovecoder can reproduce locally:

WARNING: You are currently running a version of TypeScript which is not officially supported by @typescript-eslint/typescript-estree.

You may find that it works just fine, or you may not.

SUPPORTED TYPESCRIPT VERSIONS: >=4.7.4 <5.5.0

YOUR TYPESCRIPT VERSION: 5.5.4

Please only submit bug reports when using the officially supported version.

This PR:

1. Removes the override section from frontend/packages.json, since overrides only work in the root package.json ([DOCS] Please document "The overrides key will only be considered when it is in the root package.json file for a project" npm/cli#4517).
2. Add an override for typescript 5.4.5, the latest in the 5.4.x series
3. Uninstall and re-install packages to get them all on typescript 5.4.5,
4. Fix the return type of formatRangeToParts to get typescript passing

How to test:

1. Run npm install
2. Run npm list typescript. All versions should be 5.4.5. If not, you may need to remove node_modules and frontend/node_modules, then start over at step 1
3. In the frontend folder, run npm run build to build the frontend. There should be no errors.
4. Still in the frontend folder, run npm run lint to lint the frontend. There should be no warnings.