8.4 release notes, http URL and config fixes

[droserasprout]

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[Copilot]

Pull Request Overview

This PR introduces several fixes and improvements for release 8.4 focusing on updating configuration for the watchdog service, adjusting HTTP URL handling in datasources, and updating documentation and release notes accordingly.

• Refactored watchdog initialization to use a new WatchdogConfig.
• Adjusted HTTP endpoint URL assembly in the Subsquid datasource.
• Updated documentation, changelog, and command line flags to reflect the changes.

Reviewed Changes

Copilot reviewed 25 out of 25 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/dipdup/dipdup.py	Simplified watchdog configuration initialization.
src/dipdup/datasources/_subsquid.py	Modified URL formation for worker endpoint.
src/dipdup/config/init.py	Updated watchdog field type to use WatchdogConfig.
schemas/dipdup-3.0.json	Revised JSON schema to reference WatchdogConfig.
docs/config.rst	Added documentation for the new WatchdogConfig.
docs/9.release-notes/6.v7.5.md	Updated migration guide link for branch v7.0.
docs/9.release-notes/1.v8.4.md	Added release notes for version 8.4.
docs/7.references/2.config.md	Expanded reference documentation to include WatchdogConfig.
docs/5.advanced/6.sqd-cloud.md	Updated command flag for the squad cloud deployment.
docs/5.advanced/2.environment-variables.md	Adjusted text for enabling debug mode.
CHANGELOG.md	Updated release date and noted an HTTP URL merge fix.

Comments suppressed due to low confidence (3)

src/dipdup/dipdup.py:976

• The new watchdog initialization bypasses the previous merging of default configurations. Confirm that this simplified approach fully replicates the intended behavior for legacy configurations.

watchdog.initialize(self._ctx.config.advanced.watchdog)

src/dipdup/datasources/_subsquid.py:115

• Removing the base URL (self._config.url) from the worker endpoint may lead to incorrect URL formation. Verify that the base URL is concatenated elsewhere or that this change is intentional.

f'{level}/worker'

docs/5.advanced/6.sqd-cloud.md:34

• The command now uses the '-C' flag for specifying the config; ensure that related documentation and usage examples are updated to reflect this new behavior.

cmd: ["dipdup", "-C", "squid-cloud", "run"]