feat: added new action for qrcode popup on link-share actions

[emoral435]

• Resolves nextcloud-gmbh/customer-feature-requests#702

Summary

• We somehow already had a QR code library in the main server repository... dunno where it is used, though! Weird, but using that, I generated an img element with the corresponding link-shares URL encoded into the QR code. Check it out for yourself, its pretty cool!
• QR Code uses the same link as the regular link share uses

Feature Visuals

Desktop
Mobile

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[github-actions]

Possible performance regression detected

Show Output

564 queries added
= /remote.php/dav/files/test
= /remote.php/dav/files/test/test.txt
= /remote.php/dav/files/test/many_files
= /remote.php/dav/files/test/new_file.txt
= /remote.php/dav/files/test/new_file.txt
= /remote.php/dav/files/test
= /remote.php/dav/files/test/test.txt
= /remote.php/dav/files/test/many_files
= /remote.php/dav/files/test/new_file.txt
= /remote.php/dav/files/test/new_file.txt
+ /remote.php/dav/files/test added with 45 queries
+ /remote.php/dav/files/test/test.txt added with 33 queries
+ /remote.php/dav/files/test/many_files added with 46 queries
+ /remote.php/dav/files/test/new_file.txt added with 67 queries
+ /remote.php/dav/files/test/new_file.txt added with 91 queries
+ /remote.php/dav/files/test added with 45 queries
+ /remote.php/dav/files/test/test.txt added with 33 queries
+ /remote.php/dav/files/test/many_files added with 46 queries
+ /remote.php/dav/files/test/new_file.txt added with 67 queries
+ /remote.php/dav/files/test/new_file.txt added with 91 queries

[emoral435]

Updated the icon for clipboard as well, continuing off @susnux 's recommendation to clean up some of the icon usage :)

Screenshot:

[susnux]

Thank you for the icon changes!
Added some comments

[emoral435]

Resolved all comments :)

[susnux]

👍 thank you!

[ShGKme]

Looks good code-wise, but haven't tested with the latest changes.

[skjnldsv]

I'll rebase and force merge, everything is green otherwise