refactor(@angular-devkit/core): fix up internal typings

[crisbeto]

Resolves some type errors that showed up internally.

[alan-agius4]

Looks like the API Extractor doesn't like the new Symbol

Analysis will use the bundled TypeScript version 5.4.2
Internal Error: Unable to follow symbol for "MapIterator"

[JeanMeche]

Fwiw we dropped support for 5.4 in v19 angular/angular#57577
Edit: It looks like MapIterator is only available in 5.6.

[crisbeto]

Yeah I'll look for a different solution since the latest version of the API extractor is still on 5.4.

[crisbeto]

I've worked around it using a resolution until the API extractor gets updated to TS 5.6.

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}