build: bump Angular to 15

[ndr-brt]

What this PR changes/adds

Bump angular to version 15

Why it does that

dependency update

Further notes

• had to adapt some css here and there, there could be other outdated stuff we're using, but the layout is pretty stable now.

Linked Issue(s)

Closes # <-- insert Issue number if one exists

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[janpmeyer]

I cant build the docker images with the docker compose command.

Error:

25.49 Error: bundle initial exceeded maximum budget. Budget 1.20 MB was not met by 142.00 kB with a total of 1.34 MB.

Solution should be to set up the budget Values in the angular.json file. Reference https://stackoverflow.com/questions/53995948/warning-in-budgets-maximum-exceeded-for-initial

Current ErrorBudget is set to 1.2 MB.

[ndr-brt]

@janpmeyer fixed, I also took the opportunity to add the first e2e with cypress, for the moment it just verifies that the test environment spins up correctly.

[janpmeyer]

Need to change the css files for this Links. Or do you like this Hyperlink underlines.

I have no much expertise for workflows, mabey you wanna get checked by sb. with more
knowledge in this topic.

[ndr-brt]

@janpmeyer removed the underline from the menu