This pull request introduces a feature aimed at improving the debugging experience during workflow editing. With the addition of variable persistence, the system will automatically retain the output variables from previously executed nodes. These persisted variables can then be reused when debugging subsequent nodes, eliminating the need for repetitive manual input.

By streamlining this aspect of the workflow, the feature minimizes user errors and significantly reduces debugging effort, offering a smoother and more efficient experience.

Key highlights of this change:

- Automatic persistence of output variables for executed nodes.
- Reuse of persisted variables to simplify input steps for nodes requiring them (e.g., `code`, `template`, `variable_assigner`).
- Enhanced debugging experience with reduced friction.

Closes #19735.

Co-authored-by: André de Matteo <andre.matteo@accenture.com>
Co-authored-by: crazywoola <100913391+crazywoola@users.noreply.github.com>

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Signed-off-by: Yuichiro Utsumi <utsumi.yuichiro@fujitsu.com>

The `validators.url` method from the `validators==0.21.0` library enforces a
URL length limit of less than 90 characters, which led to failures in external
knowledge API requests for long URLs.

This PR addresses the issue by replacing `validators.url` with 
`urllib.parse.urlparse`, effectively removing the restrictive URL length check.

Additionally, the unused `validators` dependency has been removed.

Fixes #18981.

Signed-off-by: kenwoodjw <blackxin55+@gmail.com>

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