chore(answers): add validation of submit_id (M2-6851)

[vshvechko]

• Tests for the changes have been added

📝 Description

🔗 Jira Ticket M2-6851

Changes include:

• Validation of submit_id for activity and flow submissions

Validation includes:

• submit_id uniqueness for activity submissions
• submit_id uniqueness for different flow submissions
• submit_id ordering in flow submissions:

Valid case of answers for activities for the flow with 3 activity:
1. answer_activity1
2. answer_activity2
3. answer_activity3

Invalid case#1:
1. answer_activity2

Invalid case#2:
1. answer_activity1
2. answer_activity3

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[github-actions]

❌ E2E tests failed