Can't add/rename/delete pages after naming a page `.`

[mlqn]

Description of the bug

Can't add/rename/delete pages after naming a page .

Steps To Reproduce

https://github.com/Altinn/altinn-studio/assets/24462611/c11d0158-2b29-48fc-b7d5-b96ddccf93d5

Additional Information

No response

[nkylstad]

So we should probably not allow . as a page name then 😊 Limiting to only text and numbers might be a good restriction to add.

[JamalAlabdullah]

New update for the bug because the old one was in v3: When using (.) in the name of the page we can add a new page but it is not possible to rename or delete it.

https://github.com/Altinn/altinn-studio/assets/90609090/bad785e5-088a-4538-9517-d2c0851a2db5

[lassopicasso]

Tested in dev - works as expected :)