Previously, Angular devtools would mistakenly traverse the same DOM elements multiple times while doing traversal for the component tree explorer. This error case would occur when more than 1 Angular application root component was present on the same page and in distinct DOM branches.
Some example cases that did work previously:
```html
<app-root>
...
</app-root>
```
```html
<app-root>
...
<app-root-2></app-root-2>
...
</app-root>
```
An example of where it would enter the irregular behaviour
```html
<app-root>
...
</app-root>
<app-root-2>
...
</app-root-2>
```
Now, we properly ignore duplicate DOM paths when looking for application and non-application root component to begin the Angular DevTools component discovery logic.
PR Close#62719
Previously these tests would run automatically when Angular DevTools lived in another repo. These files have continued to live here but have not been running automatically on each PR.
Now, these test files have been revived to run properly with our changes since the repo merge. This is a first step to reviving our e2e testing.
Next steps include writing cypress tests for new features like Injector Graph, Router tree, signals visualizations, etc.
PR Close#61972
Previously these tests would run automatically when Angular DevTools lived in another repo. These files have continued to live here but have not been running automatically on each PR.
Now, these test files have been revived to run properly with our changes since the repo merge. This is a first step to reviving our e2e testing.
Next steps include writing cypress tests for new features like Injector Graph, Router tree, signals visualizations, etc.
PR Close#61972
This commit runs tslint --fix with the angular/angular tslint configuration on the files inside the devtools codebase.
Notably, the file-header rule in `tslint.json` was missing a default attribute. This commit adds that default attribute and sets it to the
license header that is present in all files in this repo. After running tslint --fix with this default added, this commit added the license header to all files in the devtools directory. Note for the reviewer: the automatically added license headers were added as comments with the "/*!" prefix. Since we want these comments removed in builds, and the rest of the codebase uses "/**", a simple find and replace was performed on the devtools directory to change these prefixes to "/**".
Formats the entire devtools directory with the ng-dev formatting tool. Previously we relied on prettier, so this commit also remove prettier from devtools' dependencies.
Uses `cy.contains` as one command to optimize cypress' retry-ability mechanism
Affected tests are in:
`property-update.e2e.js` and `view-component-metadata.e2e.js`
