[DBMON-6804] Add Postgres 19 support

[sethsamuel]

Add Postgres 19 (19beta1) to the postgres test matrix, using the POSTGRES_IMAGE_TAG mechanism to pin the beta image while 19 is pre-GA.

What does this PR do?

Motivation

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add qa/required if this PR needs QA validation, or qa/skip-qa if it does not. Exactly one of the two is required.
• 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

[datadog-datadog-prod-us1]

   

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🚦 7 Pipeline jobs failed

PR | test / test-minimum-base-package (linux, ubuntu-22.04, postgres, Postgres (py3.13-19.0-C), py3.13-19.0-C) / minimum-base-package-Postgres (py3.13-19.0-C)-py3.13-19.0-C     

PR | test / test-minimum-base-package (linux, ubuntu-22.04, postgres, Postgres (py3.13-19.0-UTF8), py3.13-19.... / minimum-base-package-Postgres (py3.13-19.0-UTF8)-py3.13-19.0-UTF8     

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ℹ️ Info

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🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 25.00%
• Overall Coverage: 94.13% (+6.10%)

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[dd-octo-sts]

Validation Report

Validation	Description	Status
ci	Validate CI configuration and code coverage settings	❌
qa-label	Validate the pull request declares whether it needs QA for the next Agent release	❌

Run ddev validate all changed --fix to attempt to auto-fix supported validations.

Passed validations (19)

Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
codeowners	Validate every integration has a CODEOWNERS entry	✅
config	Validate default configuration files against spec.yaml	✅
dep	Verify dependency pins are consistent and Agent-compatible	✅
http	Validate integrations use the HTTP wrapper correctly	✅
imports	Validate check imports do not use deprecated modules	✅
integration-style	Validate check code style conventions	✅
jmx-metrics	Validate JMX metrics definition files and config	✅
labeler	Validate PR labeler config matches integration directories	✅
legacy-signature	Validate no integration uses the legacy Agent check signature	✅
license-headers	Validate Python files have proper license headers	✅
licenses	Validate third-party license attribution list	✅
metadata	Validate metadata.csv metric definitions	✅
models	Validate configuration data models match spec.yaml	✅
openmetrics	Validate OpenMetrics integrations disable the metric limit	✅
package	Validate Python package metadata and naming	✅
readmes	Validate README files have required sections	✅
saved-views	Validate saved view JSON file structure and fields	✅
version	Validate version consistency between package and changelog	✅

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