[AI-6420] Size models for quality gates

[lucia-sb]

What does this PR do?

This PR introduces the models that define the structure of the size reports used by the quality gates. Since this change does not affect ddev users and is not included in the agent, no changelog entry is included.

Motivation

The quality gates will use these models to parse and validate the JSON files that contain the size information.

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

❌ Patch coverage is 95.69892% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.01%. Comparing base (264caef) to head (ca1099f).
⚠️ Report is 27 commits behind head on master.

Additional details and impacted files

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[datadog-official]

⚠️ Tests

✨ Fix all issues with Cursor

⚠️ Warnings

❄️ 3 New flaky tests detected

test_backend_transaction_age from test_pg_integration.py (Datadog) (Fix with Cursor)

Needed exactly 1 candidates for 'postgresql.activity.backend_xmin_age', got 0
Expected:
        MetricStub(name='postgresql.activity.backend_xmin_age', type=None, value=1, tags=['app:test_backend_transaction_age_1766048082.7667005', 'database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'port:5432', 'postgresql_cluster_name:primary', 'postgresql_version:12.17', 'replication_role:master', 'system_identifier:7585118529137610781', 'user:datadog'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected name: postgresql.activity.backend_xmin_age
        Found postgresql.activity.backend_xid_age

Similar submitted:
Score   Most similar
0.97    MetricStub(name='postgresql.activity.backend_xid_age', type=0, value=1.0, tags=['app:test_backend_transaction_age_1766048082.7667005', 'database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'port:5432', 'postgresql_cluster_name:primary', 'postgresql_version:12.17', 'replication_role:master', 'system_identifier:7585118529137610781', 'user:datadog'], hostname='stubbed.hostname', device=None, flush_first_value=False)
...

test_conflicts_snapshot from test_pg_replication.py (Datadog) (Fix with Cursor)

Needed at least 1 candidates for 'postgresql.conflicts.snapshot', got 0
Expected:
        MetricStub(name='postgresql.conflicts.snapshot', type=None, value=1, tags=['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'port:5434', 'postgresql_version:12.17', 'replication_role:standby'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected name: postgresql.conflicts.snapshot
        Found postgresql.conflicts.lock

Similar submitted:
Score   Most similar
0.89    MetricStub(name='postgresql.conflicts.lock', type=3, value=1.0, tags=['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'port:5434', 'postgresql_version:12.17', 'replication_role:standby'], hostname='stubbed.hostname', device=None, flush_first_value=False)
...

test_physical_replication_slots from test_replication_slot.py (Datadog) (Fix with Cursor)

Expected postgresql.replication_slot.xmin_age with tags ['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'port:5432', 'postgresql_version:12.17', 'replication_role:master', 'slot_name:replication_slot', 'slot_persistence:permanent', 'slot_state:active', 'slot_type:physical'] to have a value <= 1, got 33.0

🧪 2 Tests failed

test_custom_queries[incorrect formatting custom query] from test_integration.py (Datadog) (Fix with Cursor)

assert "Invalid syntax: no viable alternative at input 'selectt'." in "ERROR    datadog_checks.base.checks.base.cloudera:api_v7.py:221 Skipping custom query query='selectt' tags=('baz',) due to the following exception: 'HTTPResponse' object has no attribute 'getheaders'\n"
 +  where "ERROR    datadog_checks.base.checks.base.cloudera:api_v7.py:221 Skipping custom query query='selectt' tags=('baz',) due to the following exception: 'HTTPResponse' object has no attribute 'getheaders'\n" = <_pytest.logging.LogCaptureFixture object at 0x7f9228d2cd60>.text

test_custom_queries[non existent metric custom query] from test_integration.py (Datadog) (Fix with Cursor)

assert "Invalid metric 'fake_foo' in 'select fake_foo'" in "ERROR    datadog_checks.base.checks.base.cloudera:api_v7.py:221 Skipping custom query query='select fake_foo' tags=('baz',) due to the following exception: 'HTTPResponse' object has no attribute 'getheaders'\n"
 +  where "ERROR    datadog_checks.base.checks.base.cloudera:api_v7.py:221 Skipping custom query query='select fake_foo' tags=('baz',) due to the following exception: 'HTTPResponse' object has no attribute 'getheaders'\n" = <_pytest.logging.LogCaptureFixture object at 0x7f923c0cefd0>.text

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