Finalize Agent release 7.78.4

[datadog-agent-integrations-bot]

What does this PR do?

Finalize Agent release 7.78.4 updating the changelog files.

Motivation

Agent 7.78.4 has been released.

Additional Notes

This PR was automatically generated.

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove unreleased Agent 7.78.4 entry

This adds 7.78.4 as a released Agent version, but the public datadog-agent releases page/CHANGELOG currently lists 7.78.3 as the latest release and has no 7.78.4 section or #7784 anchor, so this link points to a non-existent release and the new integrations snapshot advertises an Agent version users cannot find or install. Please only add this block after the Agent release/tag exists upstream.

Useful? React with 👍 / 👎.

[dd-octo-sts]

Validation Report

All 20 validations passed.

Show details

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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