fix(ui): unknown date in bg task dialog box (#17140)

[CelineSebe]

Proposed changes

• formatting in dataTable toolbar .ISO

Related issues

• closes fix(bg-tasks): Dates for background tasks are unknown in dialog box #17140

How to test this PR

1. Select an user in users list
2. Click on Update paint button
3. Select "Replace" in action type, " account lock date" in field (or password change date), select a date in time picker => click on OK
4. Update
5. Date is no longer "unknown"

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant use cases (coverage and e2e)
• I added/updated the relevant documentation (either on GitHub or on Notion)
• Where necessary, I refactored code to improve the overall quality

Further comments

[Copilot]

Pull request overview

This PR addresses issue #17140 where date values configured via the DataTable background task “Update” dialog (notably user account expiration and password change dates) can display as “Unknown date”, by normalizing accepted picker values into ISO-8601 strings.

Changes:

• Initialize the account_lock_after_date replace-field similarly to other date fields.
• Normalize accepted DateTimePicker values to ISO strings in handleAcceptDate so downstream rendering/parsing doesn’t receive raw Date objects.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.08%. Comparing base (6ad5834) to head (03d51bf).

Files with missing lines	Patch %	Lines
...t/src/private/components/data/DataTableToolBar.jsx	0.00%	9 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (80.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #17142      +/-   ##
==========================================
- Coverage   33.08%   33.08%   -0.01%     
==========================================
  Files        3323     3323              
  Lines      134679   134687       +8     
  Branches    36268    36272       +4     
==========================================
+ Hits        44560    44562       +2     
- Misses      90119    90125       +6     

Flag	Coverage Δ
opencti-client-python	46.40% <ø> (ø)
opencti-front	9.79% <0.00%> (-0.01%)	⬇️
opencti-graphql	68.48% <ø> (+<0.01%)	⬆️

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