fix: handle ical.js group parameter form to prevent custom label corruption on save/re-fetch cycle

[pallavibakale]

• Fix custom label (X-ABLABEL) handling to correctly work with properties loaded from the server
• Prevent prefix corruption (e.g NEXTCLOUD1.TEL) when re-applying a custom label after a save/fetch cycle
• Fix propGroup and propLabel to detect the group parameter form that ical.js uses after parsing from server

Fixes: #5302

[hamza221]

Hello,
Thank you for opening this PR,
The diff is really big and it looks like it's mostly spacing related fixes.
Can you please run npm ci then npm run lint:fix then push again

[codecov]

Codecov Report

❌ Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...mponents/ContactDetails/ContactDetailsProperty.vue	0.00%	17 Missing ⚠️
src/mixins/PropertyMixin.js	0.00%	11 Missing and 6 partials ⚠️

📢 Thoughts on this report? Let us know!

[pallavibakale]

Hello, Thank you for opening this PR, The diff is really big and it looks like it's mostly spacing related fixes. Can you please run npm ci then npm run lint:fix then push again

Hello Hamza, I have fixed the linting issues, the PR looks cleaner than before.
The DCO also failed, I ran the below to fix the issue:

git rebase HEAD~5 --signoff  
git push --force-with-lease origin fix/custom-label-for-contact-details-5302

Will do the same for the other PR as well.