prompty: expose the 'model' property for use in flex flows

[ianchi]

Description

Useful in flex flows for instance to adapt the external logic to some conditions (.i.e if the api is chat or completion, if it is streaming or not, etc).

Solves #3813

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.
• 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]

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.

[ianchi]

Hi, any chance to advance with this?

[ianchi]

Hi, any chance to advance with this?

[github-actions]

SDK CLI Global Config Test Result model

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Results for commit 9c963e4.

[github-actions]

Executor Unit Test Result model

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Results for commit 9c963e4.

[github-actions]

Executor E2E Test Result model

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0 suites  0 💤
0 files    0 ❌

Results for commit 9c963e4.

[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.

[github-actions]

Hi, thank you for your contribution. Since there has not been recent engagement, we are going to close this out. Feel free to reopen if you'd like to continue working on these changes. Please be sure to remove the no-recent-activity label; otherwise, this is likely to be closed again with the next cleanup pass.