Migrate templates from notify_no_data to on_missing_data

[zgarciadd]

Migrate all recommended monitor templates to use on_missing_data instead of the deprecated notify_no_data. This is a preliminary step to blocking all future usages of notify_no_data.

[dd-octo-sts]

⚠️ Recommendation: Add qa/skip-qa label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.

[dd-octo-sts]

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Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and Codecov settings	✅
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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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Preserve explicit no-data timeframes when migrating

This monitor previously had notify_no_data: true with no_data_timeframe: 120, but on_missing_data uses the query's own time window instead of the old configurable no-data window. Because this query evaluates last_5m, missing Velero data now starts sending NO DATA notifications after about 5 minutes instead of the intended 2 hours; the same migration pattern shortens other alerting delays such as backup_failures (480 minutes) and restore_failures (30 minutes).

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[zgarciadd]

This is an intended change in behavior, and is what would happen for, e.g., a monitor that was edited and re-saved under the new pattern