This pull request adds support for managing the installation and
uninstallation of Postman on Windows via Winget, and simplifies the
associated PowerShell scripts. The changes introduce a new Postman app
definition, refactor the install and uninstall scripts to remove
unnecessary complexity, and update the Postman icon in the frontend to
use a PNG image.
**Postman app management support:**
* Added a new `postman.json` manifest in
`ee/maintained-apps/inputs/winget/` to define Postman as a managed
application, including install/uninstall script paths and package
metadata.
**PowerShell script simplification:**
* Refactored `postman_install.ps1` to remove scheduled task logic and
run the installer directly with the `--silent` flag, improving
reliability and maintainability.
* Simplified `postman_uninstall.ps1` to directly search for and execute
the uninstall command for Postman, supporting silent uninstallation and
removing scheduled task and logging logic.
**Frontend update:**
* Updated the `Postman.tsx` icon component to use a PNG image instead of
inline SVG paths, ensuring consistency with other icon assets.
> For #26662
# Checklist for submitter
If some of the following don't apply, delete the relevant line.
<!-- Note that API documentation changes are now addressed by the
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- [x] A detailed QA plan exists on the associated ticket (if it isn't
there, work with the product group's QA engineer to add it)
- [x] Manual QA for all new/changed functionality
