[Executor][Bugfix] Adjust flow traces logic to make sure error is correctly raised

[thy09]

Description

Currently flow level trace is always "Success" since we wrapped it in wrong place.
Update such code to make sure the error is correctly caught in the span.

This pull request includes significant changes to the FlowExecutor class in the src/promptflow/promptflow/executor/flow_executor.py file. The primary changes involve refactoring the _exec_with_trace method and its usages throughout the class. The method has been split into two separate methods: _exec_inner_with_trace and _exec_inner. The functions _exec, exec_line, _exec_in_thread, and exec have been updated to use these new methods. The changes aim to improve the readability and maintainability of the code.

Updates to method usages:

• The exec method now calls _exec instead of _exec_with_trace.
• The _exec_in_thread method now calls _exec instead of _exec_with_trace.
• The exec_line method now calls _exec instead of _exec_with_trace.
• The _exec method now calls _exec_inner_with_trace instead of containing the logic that was moved to _exec_inner.

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 heta/failure-trace

2 tests   2 ✅  46s ⏱️
1 suites  0 💤
1 files    0 ❌

Results for commit 71a024e.

♻️ This comment has been updated with latest results.

[github-actions]

promptflow SDK CLI Azure E2E Test Result heta/failure-trace

  4 files    4 suites   3m 22s ⏱️
148 tests 127 ✅ 21 💤 0 ❌
592 runs  508 ✅ 84 💤 0 ❌

Results for commit 71a024e.

♻️ This comment has been updated with latest results.

[github-actions]

Executor Unit Test Result heta/failure-trace

733 tests   733 ✅  45s ⏱️
  1 suites    0 💤
  1 files      0 ❌

Results for commit 71a024e.

♻️ This comment has been updated with latest results.

[github-actions]

Executor E2E Test Result heta/failure-trace

197 tests   195 ✅  4m 11s ⏱️
  1 suites    2 💤
  1 files      0 ❌

Results for commit 71a024e.

♻️ This comment has been updated with latest results.

[github-actions]

SDK CLI Test Result heta/failure-trace

   12 files     12 suites   43m 42s ⏱️
  424 tests   408 ✅ 16 💤 0 ❌
1 696 runs  1 632 ✅ 64 💤 0 ❌

Results for commit 71a024e.

♻️ This comment has been updated with latest results.