Add schema tag to vacuum progress queries and fix max_dead_tuple_discrepancies

[joelmarcotte]

What does this PR do?

Motivation

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

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.28%. Comparing base (8c6c226) to head (1284bd1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

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[datadog-official]

⚠️ Tests

⚠️ Warnings

🧪 2 Tests failed

test_vacuum_progress from test_progress_stats.py (Datadog)

Needed exactly 1 candidates for 'postgresql.vacuum.heap_blks_total', got 0
Expected:
        MetricStub(name='postgresql.vacuum.heap_blks_total', type=None, value=None, tags=['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'phase:scanning heap', 'port:5432', 'postgresql_version:17.7', 'replication_role:master', 'table:test_part1'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected tag schema:None
        Found schema:public

Similar submitted:
Score   Most similar
0.99    MetricStub(name='postgresql.vacuum.heap_blks_total', type=0, value=3.0, tags=['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'phase:scanning heap', 'port:5432', 'postgresql_version:17.7', 'replication_role:master', 'schema:public', 'table:test_part1'], hostname='stubbed.hostname', device=None, flush_first_value=False)
...

test_vacuum_progress_lt_17 from test_progress_stats.py (Datadog)

Needed exactly 1 candidates for 'postgresql.vacuum.heap_blks_total', got 0
Expected:
        MetricStub(name='postgresql.vacuum.heap_blks_total', type=None, value=None, tags=['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'phase:scanning heap', 'port:5432', 'postgresql_version:16.11', 'replication_role:master', 'table:test_part1'], hostname=None, device=None, flush_first_value=None)
Difference to closest:
        Expected tag schema:None
        Found schema:public

Similar submitted:
Score   Most similar
0.99    MetricStub(name='postgresql.vacuum.heap_blks_total', type=0, value=3.0, tags=['database_hostname:stubbed.hostname', 'database_instance:stubbed.hostname', 'db:datadog_test', 'dd.internal.resource:database_instance:stubbed.hostname', 'foo:bar', 'phase:scanning heap', 'port:5432', 'postgresql_version:16.11', 'replication_role:master', 'schema:public', 'table:test_part1'], hostname='stubbed.hostname', device=None, flush_first_value=False)
...

ℹ️ Info

❄️ No new flaky tests detected

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