[SDK/CLI] Support chat group node test in an experiment

[0mza987]

Description

Please add an informative description that covers that changes made by the pull request and link all relevant issues.

All Promptflow Contribution checklist:

• The pull request does not introduce [breaking changes].
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.
• Create an issue and link to the pull request to get dedicated review from promptflow team. Learn more: suggested workflow.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

SDK CLI Global Config Test Result hod/cg-test

3 tests   3 ✅  46s ⏱️
1 suites  0 💤
1 files    0 ❌

Results for commit c0ae088.

♻️ This comment has been updated with latest results.

[github-actions]

promptflow SDK CLI Azure E2E Test Result hod/cg-test

  4 files    4 suites   5m 27s ⏱️
196 tests 176 ✅ 20 💤 0 ❌
784 runs  704 ✅ 80 💤 0 ❌

Results for commit c0ae088.

♻️ This comment has been updated with latest results.

[github-actions]

SDK CLI Test Result hod/cg-test

   12 files     12 suites   47m 57s ⏱️
  497 tests   479 ✅ 18 💤 0 ❌
1 988 runs  1 916 ✅ 72 💤 0 ❌

Results for commit e8af4e6.

♻️ This comment has been updated with latest results.