feat: show signature status on files app

[vitormattos]

Pull Request Description

This pull request adds an icon to the right of the files, in the files app, showing the file signature status on the original and the signed files. The original will have the status 'Original file signed elsewhere' and the signed file will have the status 'Partially signed' and 'Signed', depending on the signing progress.

Before:	After:

To test the feature, after checking out to the pull request:

• upload a PDF file to Nextcloud using the files app;
• request the signature from two different users;
• sign the file with one of the requested users;
• the original file will show a green sign icon, with the text 'original file' when hovering over it;
• the signed file will show a yellow ½ icon, with the text 'partially signed' when hovering over it;
• now sign the file with the second requested user;
• the signed file will show a blue sign icon, with the text 'signed' when hovering over it.

Related Issue

Issue Number: #4160

Pull Request Type

• Feature

Pull request checklist

• Did you explain or provide a way of how can we test your code ?
• If your pull request is related to frontend modifications provide a print of before and after screen
• Did you provide a general summary of your changes ?
• Try to limit your pull request to one type, submit multiple pull requests if needed
• I implemented tests that cover my contribution

[vitormattos]

/backport to stable32

[vitormattos]

/backport to stable31

[backportbot-libresign]

The backport to stable32 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable32
git pull origin stable32

# Create the new backport branch
git checkout -b backport/5225/stable32

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 1bceacfb b7da03fe cee739a8 a712b3bc 77499f35 d6e00932 55c19628 7bc299be 68d5cfc6 8b1936a1 d17e426f 79cb8dbf 46a253bc 58e2da19 a495a480 370d1ecb ca743594 ab994c42 d47ab739 09df58de ae449c2b 11eb0487 a0b77abf 282ff04c b5c10808 440a72e6 ebf107f2 c82875fc 9664ed97 eac9a458

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/5225/stable32

Error: Failed to push branch backport/5225/stable32: fatal: could not read Username for 'https://github.com': No such device or address

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[vitormattos]

/backport to stable32