Fix the group last modified time in group list view

[ThaminduDilshan]

Purpose

Group last modified time is set to group created time in the group list view. This PR fixes the issue by showing the group modified time when it is present in the SCIM response.

Related Issues

• lastModified attribute of the groups does not update product-is#19244

Related PRs

• N/A

Checklist

• e2e cypress tests locally verified. (for internal contributers)
• Manual test round performed and verified.
• UX/UI review done on the final implementation.
• Documentation provided. (Add links if there are any)
• Relevant backend changes deployed and verified
• Unit tests provided. (Add links if there are any)
• Integration tests provided. (Add links if there are any)

Security checks

• Followed secure coding standards in http://wso2.com/technical-reports/wso2-secure-engineering-guidelines
• Ran FindSecurityBugs plugin and verified report
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets

[wso2-jenkins-bot]

🦋 Changeset detected

The changes in this PR will be included in the next version bump.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 32.32%. Comparing base (7a8e0c7) to head (2b1240e).
Report is 22 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7232   +/-   ##
=======================================
  Coverage   32.32%   32.32%           
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  Files          42       42           
  Lines         897      897           
  Branches      216      204   -12     
=======================================
  Hits          290      290           
- Misses        557      607   +50     
+ Partials       50        0   -50     

Flag	Coverage Δ
@wso2is/core	32.32% <ø> (ø)

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see 14 files with indirect coverage changes