[full-ci] Add pdf-viewer app

[dschmidt]

Supersedes #6575

Description

This adds a pdf viewer app which uses the native pdf support of the browser.

This cleans up the code of the original PR and makes it to good to merge imho (for a first iteration at least) when the CI is green.

We should discuss newTab and should add a way to navigate back (cc @tbsbdr @pascalwengerter @kulmann ) in followup tickets/prs.

Related Issue

• Fixes <issue_link>

Motivation and Context

among other reasons: blob urls are not bookmarkable

How Has This Been Tested?

• test environment:
• test case 1:
• test case 2:
• ...

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• ...

[update-docs]

Thanks for opening this pull request! The maintainers of this repository would appreciate it if you would create a changelog item based on your changes.

[ownclouders]

Results for oCISFiles2 https://drone.owncloud.com/owncloud/web/24077/56/1

💥 The acceptance tests failed on retry. Please find the screenshots inside ...

webUIFilesActionMenu-fileFolderActionMenu_feature-L14.png

[pascalwengerter]

Results for oCISFiles2 https://drone.owncloud.com/owncloud/web/24077/56/1
💥 The acceptance tests failed on retry. Please find the screenshots inside ...

PDF opening acceptance test now fails with

   ✔ Then the app-sidebar for file "lorem.pdf" should be visible on the webUI # stepDefinitions/filesContext.js:1025

   ✖ And only the following items with default items should be visible in the actions menu on the webUI # stepDefinitions/filesContext.js:1365

Needs an update, let's quickly discuss this tomorrow!

Update:
There's two failures in CI,

• webUIFilesActionMenu/fileFolderActionMenu.feature:14 => see text above
• webUIPrivateLinks/accessingPrivateLinks.feature:9 => see oc10IntegrationApp1 private link acceptance tests flaky #6607

[pascalwengerter]

Results for oCISFiles2 https://drone.owncloud.com/owncloud/web/24077/56/1
💥 The acceptance tests failed on retry. Please find the screenshots inside ...

PDF opening acceptance test now fails with

   ✔ Then the app-sidebar for file "lorem.pdf" should be visible on the webUI # stepDefinitions/filesContext.js:1025

   ✖ And only the following items with default items should be visible in the actions menu on the webUI # stepDefinitions/filesContext.js:1365

Needs an update, let's quickly discuss this tomorrow!

Update: There's two failures in CI,

* `webUIFilesActionMenu/fileFolderActionMenu.feature:14` => see text above

* `webUIPrivateLinks/accessingPrivateLinks.feature:9` => see [oc10IntegrationApp1 private link acceptance tests flaky #6607](https://github.com/owncloud/web/issues/6607)

Another update: The PDF viewer app wasn't added in any of the configs yet, so CI wouldn't find it in the contextMenu for .pdf files. Should be fine now, I've added it as enabled by default to all configs I could find

[pascalwengerter]

Not an appropriate reviewer since I collaborated on this one, code LGTM though, waiting for @kulmann's final review

[kulmann]

Small nitpick regarding translations, otherwise awesome! 🚀

[kulmann]

Suggested change

	title: $gettext('PDF Viewer app'),
	title: $gettext('PDF Viewer'),

[kulmann]

Suggested change

	name: 'PDF viewer',
	name: $gettext('PDF Viewer'),

[sonarqubecloud]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

0.0% Coverage
0.0% Duplication