fix: DAH-3111 Clear error message on Sign In

[cliu02]

Description

Clears error message banner when submit button is activated on the Sign In to improve feedback to user.

Jira ticket

https://sfgovdt.jira.com/browse/DAH-3111

Checklist before requesting review

Version Control

• branch name begins with angular if it contains updates to Angular code
• branch name contains the Jira ticket number
• PR name follows type: TICKET-NUMBER Description format, e.g. feat: DAH-123 New Feature. If the PR is urgent and does not need a ticket then use the format urgent: Description

Code quality

• the set of changes is small
• all automated code checks pass (linting, tests, coverage, etc.)
• code irrelevant to the ticket is not modified e.g. changing indentation due to automated formatting
• if the code changes the UI, it matches the UI design exactly
• if the changes include human translations, follow the human translations process

Review instructions

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• instructions work for PA testers
• instructions have already been performed at least once

Request review

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