fix: add middleware for datadog

[alangsto]

JIRA: COSMO-462

Description: In order to have custom spans in datadog, we need to add DeploymentMonitoringMiddleware to the exams middleware.

Merge checklist:

• All reviewers approved
• CI build is green
• Changelog record added
• Documentation updated (not only docstrings)
• Commits are squashed

Post merge:

• Delete working branch (if not needed anymore)

[github-actions]

Coverage report

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
edx_exams/apps/api/v1
views.py
edx_exams/apps/api/v1/tests
test_views.py
edx_exams/apps/core
data.py
models.py
statuses.py
views.py
edx_exams/apps/core/management/commands
bulk_add_course_staff.py
edx_exams/apps/core/management/commands/test
test_bulk_add_course_staff.py
edx_exams/apps/core/tests
test_api.py
test_context_processors.py
test_email.py
test_handlers.py
test_views.py
edx_exams/apps/lti
views.py
edx_exams/apps/lti/signals
handlers.py
edx_exams/apps/lti/signals/tests
test_handlers.py
edx_exams/apps/lti/tests
test_views.py
edx_exams/apps/router/tests
test_interop.py
test_views.py
Project Total

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