chore: handle error and cover with tests

[vitormattos]

Pull Request Description

Prevent error when the common name is bigger than 64 chars

To haven't conflicts with #5459, will be necessary merge the follow PR before add a limit at displayName field at frontend side:

• feat: sign usign twofactor_gateway #5459

Related Issue

Issue Number:

• OpenSSL does not accept DNs longer than 65 characters #5479

Pull Request Type

• Bugfix

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

How to see this running using GitHub Codespaces

1. Open the Codespace

• Authenticate to GitHub
• Go to the branch: chore/reduce-configure-check-time
• Click the Code button and select the Codespaces tab.
• Click "Create codespace on feat/customize-signature-stamp"

2. Wait for the environment to start

• A progress bar will appear on the left.
• After that, the terminal will show the build process.
• Wait until you see the message:

  ✍️ LibreSign is up!

  This may take a few minutes.

3. Access LibreSign in the browser

• Open the Ports tab (next to the Terminal).
• Look for the service running on port 80.
• Hover over the URL and click the globe icon 🌐 to open it in your browser.

4. (Optional) Make the service public

• If you want to share the app with people not logged in to GitHub, you must change the port visibility:
  • Click the three dots ⋮ on the row for port 80.
  • Select Change visibility → Public.

5. Login credentials

• Username: admin
• Password: admin

Done! 🎉
You're now ready to test this.

[vitormattos]

/backport to stable32

[vitormattos]

/backport to stable31