refactor(Angular): updated to version 20 and renamed a Custom Select component property (#4772)

* Initial plan

* Initial exploration: analyze current Angular 19 setup before updating to Angular 20

Co-authored-by: mfranzke <787658+mfranzke@users.noreply.github.com>

* Update Angular dependencies from 19.x to 20.1.x and documentation

Co-authored-by: mfranzke <787658+mfranzke@users.noreply.github.com>

* fix: issue with aria list label

* feat: added changeset

* Update sour-flies-build.md

* Add migration guide for version 3.x.x to 4.0.0

Document migration steps from version 3.x.x to 4.0.0, including property renaming and CLI automation.

* Add migration config from v3.0.0 to v4.0.0

* Add has-changes.txt with DBCustomSelect component

* Add no-change.txt with DBCustomSelect component

* refactor: regenerated package lock file

* Apply suggestion from @mfranzke

* Apply suggestion from @mfranzke

* fix: ignore test files for jscpd through configuration

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mfranzke <787658+mfranzke@users.noreply.github.com>
Co-authored-by: Nicolas Merget <nicolas.merget@deutschebahn.com>
Co-authored-by: Nicolas Merget <104347736+nmerget@users.noreply.github.com>
Co-authored-by: Maximilian Franzke <maximilian.franzke@deutschebahn.com>

Author: 3 people

.changeset/sour-flies-build.md

@@ -0,0 +1,9 @@
+---
+"@db-ux/core-components": major
+"angular-showcase": major
+"react-showcase": major
+"vue-showcase": major
+"@db-ux/docs": major
+---
+
+**BREAKING CHANGE**: refactor(Custom Select): renamed `ariaListLabel` property to `listLabel`

.config/.jscpd.json

@@ -47,6 +47,8 @@
 		"packages/foundations/assets/icons/functional/fonts/**",
 		"packages/foundations/assets/icons/fonts/**",
 		"packages/foundations/dev",
+		"packages/migration/test/**/has-changes.txt",
+		"packages/migration/test/**/no-change.txt",
 		"showcases/**/results/**",
 		"showcases/angular-showcase/.angular/cache",
 		"showcases/angular-showcase/.angular/cache/**",

docs/migration/v1.x.x-to-v2.0.0.md

@@ -7,7 +7,7 @@ Additionally, we now use the `bg-vibrant` and `on-bg-vibrant` colors for the emp
 
 ## Angular
 
-> **Note:** We upgrade the components to use [`signals`](https://angular.dev/guide/signals). This requires the latest version of Angular (18.0.0 or higher). If you are using an older version, please upgrade to the latest versions (18 or 19) of Angular.
+> **Note:** We upgrade the components to use [`signals`](https://angular.dev/guide/signals). This requires the latest version of Angular (18.0.0 or higher). If you are using an older version, please upgrade to the latest versions (18, 19, or 20) of Angular.
 
 ### Align angular events
 

docs/migration/v3.x.x-to-v4.0.0.md

@@ -0,0 +1,15 @@
+# Migration (3.x.x) ➡ 4.0.0
+
+## Custom Select: renamed `ariaListLabel` property to `listLabel`
+
+Due to Angular 20's handling of properties starting with the phrase "aria," we needed to rename the `ariaListLabel` property to `listLabel`.
+
+## Automate migration via CLI
+
+We provide a CLI tool to auto migrate your source code. Use this command in your repository:
+
+```shell
+npx @db-ux/core-migration --type=v300_v400 --src=./src
+```
+
+Please check the changes made in your codebase afterwards, as this is mainly a simple search & replace and there might be unexpected changes of similar wordings to our properties for any other methods, or further code occurrences that don't even refer to properties.