fix(chat): fix validation of message template (Issue #2270, #2295)

[IlyaBondar]

Description:

fix validation of message template

Issues:

• Issue [Message template] errors are applied to other fields (to the row below), when the row with the error is deleted #2270
• Issue [Custom application] Add padding to topics input #2295

Checklist:

• the pull request name complies with Conventional Commits
• the pull request name starts with fix(<scope>):, feat(<scope>):, feature(<scope>):, chore(<scope>):, hotfix(<scope>): or e2e(<scope>):. If contains breaking changes then the pull request name must start with fix(<scope>)!:, feat(<scope>)!:, feature(<scope>)!:, chore(<scope>)!:, hotfix(<scope>)!: or e2e(<scope>)!: where <scope> is name of affected project: chat, chat-e2e, overlay, shared, sandbox-overlay, etc.
• the pull request name ends with (Issue #<TICKET_ID>) (comma-separated list of issues)
• I confirm that do not share any confidential information like API keys or any other secrets and private URLs

[IlyaBondar]

/deploy-review

Environment URL: https://chat-ai-dial-chat-pr-2299.nightly-test.deltixhub.io
E2E tests status: success