Don't run scheduled GitHub actions on forks

[marekdedic]

Hi,
all the GitHub actions which are run on a schedule probably don't need to run on forks. Some of them even fail to run due to missing secrets. This PR disables all scheduled actions on forks.

Please verify that:

• There is an associated issue in the Backlog milestone (required)
• Code is up-to-date with the main branch
• You've successfully run gulp runtests locally
• There are new or updated unit tests validating the change

Fixes #48694

[typescript-bot]

This PR doesn't have any linked issues. Please open an issue that references this PR. From there we can discuss and prioritise.

[jakebailey]

Do we need these tasks on typescript-bot's fork?

[weswigham]

Nah, don't think so. Its fork is just a safe place for it to push branches to.

[sandersn]

Good idea. Let's merge this on Monday instead of right before the weekend.

[andrewbranch]

This is a syntax error ☹️ https://github.com/microsoft/TypeScript/actions/runs/2222447002

[jakebailey]

I think it's because there are two if blocks.

[marekdedic]

Ah, sorry, didn't notice the other if block :/

[andrewbranch]

No worries, at first I thought something was wrong with all of them. How does GH not automatically check PRs to their own workflow files??