Send userGroups info in http notifications

[diyarab]

What does this PR do?

• [x] Adds new functionality
• [ ] Alters existing functionality
• [ ] Fixes a bug
• [ ] Improves documentation or testing

This PR enhances the event notifier's HTTP notifications by explicitly including user groups along with the already available username and user email. If any information is missing, it will be omitted.

Code Quality Checklist

• [ ] The documentation is up to date.
• [x] My code is sufficiently commented and passes continuous integration checks.
• [x] I have signed my commit (see Contributing Docs).

Testing

• [x] I leveraged continuous integration testing
  • [x] by depending on existing unit tests or end-to-end tests.
  • [ ] by adding new unit tests or end-to-end tests.
• [x] I manually tested the following steps:
  • x
  • [x] locally.
  • [ ] as a canary deployment to a cluster.

[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: diyarab/http-send-usergroups Commit report: 5509583 Test service: chaos-controller

:white_check_mark: 0 Failed, 738 Passed, 2 Skipped, 16m 58.55s Total Time :snowflake: 1 New Flaky

New Flaky Tests (1)

• [It] Disruption Controller node level should target the node - Controller Suite - Last Failure

  Expand for error

  ``` Timed out after 334.712s. Expected success, but got an error: <*errors.errorString | 0xc0003a5430>: disruptions does not has expected status yet, retrying, current status is PreviouslyNotInjected, allowed statuses are [Injected] { s: "disruptions does not has expected status yet, retrying, current status is PreviouslyNotInjected, allowed statuses are [Injected]", } [FAILED] Timed out after 334.712s. Expected success, but got an error: ... ```