## Description
<ins>Problem</ins>
Inbuilt email validation was not functioning correctly for all valid
email formats (e.g. `rahul+3@appsmith.com`), leading to incorrect
validation failures in the Input widget.
<ins>Root cause</ins>
Outdated or overly restrictive email validation regex in
`InputWidgetV2`.
<ins>Solution</ins>
This PR handles updating the email validation regex in `InputWidgetV2`
to support modern and valid email formats.
It also refactors and enhances the validation test suite to improve
coverage across input types (NUMBER, TEXT, EMAIL, PASSWORD) and
validation scenarios (required, custom, and regex), improving accuracy,
readability, and maintainability.
Fixes #`Issue Number`
_or_
Fixes https://github.com/appsmithorg/appsmith-ee/issues/7550
> [!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.Input"
### 🔍 Cypress test results
<!-- This is an auto-generated comment: Cypress test results -->
> [!TIP]
> 🟢🟢🟢 All cypress tests have passed! 🎉🎉🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/15133467577>
> Commit: 35d061427857620e3c3a4a2b6e5a7d1b532652aa
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=15133467577&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Input`
> Spec:
> <hr>Tue, 20 May 2025 09:29:25 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
- **Bug Fixes**
- Improved email validation to support a wider range of valid email
formats.
- **Tests**
- Expanded and reorganized input validation tests to cover more input
types and edge cases, ensuring more robust validation across NUMBER,
TEXT, EMAIL, and PASSWORD fields.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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