Refactor: remove unnecessary code from flow_executor.py

[hiroki0525]

Description

I have found that they are not used in the current code in flow_executor.py.
Perhaps they were forgotten to be removed in past changes.

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.
• I confirm that all new dependencies are compatible with the MIT license.
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General Guidelines and Best Practices

• Title of the pull request is clear and informative.
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Testing Guidelines

• Pull request includes test coverage for the included changes.

[github-actions]

Hi, thank you for your interest in helping to improve the prompt flow experience and for your contribution. We've noticed that there hasn't been recent engagement on this pull request. If this is still an active work stream, please let us know by pushing some changes or leaving a comment.

[hiroki0525]

@microsoft/promptflow-sdk
Excuse me, when can I have a review?

[github-actions]

SDK CLI Global Config Test Result remove-unnecessary-code

0 tests   0 ✅  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit 8a4f9f6.

[github-actions]

Executor E2E Test Result remove-unnecessary-code

0 tests   0 ✅  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit 8a4f9f6.

[github-actions]

Executor Unit Test Result remove-unnecessary-code

0 tests   0 ✅  0s ⏱️
0 suites  0 💤
0 files    0 ❌

Results for commit 8a4f9f6.