## Description
### Type of Change
- API Change
- Interface Modification
### Changes
This PR updates the return type of getPluginSchema method in the plugin
schema solution:
- Changed return type from Mono<JsonNode> to Mono<List<Object>> in both
the interface and implementation
- Updated import statements to reflect the type change
- Removed unused Jackson dependency import
Fixes #`Issue Number`
_or_
Fixes `Issue URL`
> [!WARNING]
> _If no issue exists, please create an issue first, and check with the
maintainers if the issue is valid._
## Automation
/ok-to-test tags="@tag.Sanity"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!IMPORTANT]
> 🟣🟣🟣 Your tests are running.
> Tests running at:
<https://github.com/appsmithorg/appsmith/actions/runs/15203195158>
> Commit: bedbd384ebcfef51e1af2d1882ddc46380fa8294
> Workflow: `PR Automation test suite`
> Tags: `@tag.Sanity`
> Spec: ``
> <hr>Fri, 23 May 2025 05:41:48 UTC
<!-- end of auto-generated comment: Cypress test results -->
## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
- **Refactor**
- Updated the internal structure for retrieving plugin schemas, changing
the expected format from a JSON node to a list of objects. This may
affect how plugin schema data is processed or displayed in future
updates. No visible changes to current user experience.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Co-authored-by: Nilesh Sarupriya <20905988+nsarupr@users.noreply.github.com>
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