Upgrade to Angular 20

[travist]

https://formio.atlassian.net/browse/FIO-10726

Description

This is a pull request that upgrades to the latest Angular 20 version.

Breaking Changes / Backwards Compatibility

No breaking changes.

Dependencies

None

How has this PR been tested?

Manual

Checklist:

• I have completed the above PR template
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• My changes include tests that prove my fix is effective (or that my feature works as intended)
• New and existing unit/integration tests pass locally with my changes
• Any dependent changes have corresponding PRs that are listed above

[lucasbode]

@travist any idea when this PR might be revisited? Our team is starting the migration to angular 20 soon.

[lane-formio]

@lucasbode
I can't give a timeline in the moment, but I am going to make sure this is on the radar.