<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#38536
- Moved PostJSONWithTimeout to platform/http
- Created platform/errors package with only types needed by ctxerr. This
way, ctxerr did not need to import fleethttp.
- Made activity bounded context use PostJSONWithTimeout directly
- Removed some activity types from legacy code that were no longer
needed
# Checklist for submitter
- [ ] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
- Changes file `38536-new-activity-bc` already present, and this is just
cleanup from that work.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
## Release Notes
* **Refactor**
* Reorganized error handling utilities for improved clarity and
decoupling.
* Consolidated HTTP utilities to centralize JSON posting functionality
with timeout support.
* Simplified activity service initialization by removing unused internal
parameters.
* Cleaned up test utilities and removed webhook-related test
scaffolding.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#38536
This PR moves all logic to create new activities to activity bounded
context.
The old service and ActivityModule methods are not facades that route to
the new activity bounded context. The facades will be removed in a
subsequent PR.
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added webhook support for activity events with configurable endpoint
and enable/disable settings.
* Enhanced automation-initiated activity creation without requiring a
user context.
* Improved activity service architecture with centralized creation and
management.
* **Improvements**
* Refactored activity creation to use a dedicated service layer for
better separation of concerns.
* Added support for host-specific and automation-originated activities.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
<!-- Add the related story/sub-task/bug number, like Resolves#123, or
remove if NA -->
**Related issue:** Resolves#38534
moved `/api/_version_/fleet/hosts/{id:[0-9]+}/activities` endpoint and
`MarkActivitiesAsStreamed` to activity bounded context
# Checklist for submitter
- [x] Changes file added for user-visible changes in `changes/`,
`orbit/changes/` or `ee/fleetd-chrome/changes`.
## Testing
- [x] Added/updated automated tests
- [x] Where appropriate, [automated tests simulate multiple hosts and
test for host
isolation](https://github.com/fleetdm/fleet/blob/main/docs/Contributing/reference/patterns-backend.md#unit-testing)
(updates to one hosts's records do not affect another)
- [x] QA'd all new/changed functionality manually
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added new endpoint to retrieve host-specific past activities with
pagination metadata.
* **Refactor**
* Refactored activity service architecture and authorization layer to
improve data provider integration and activity streaming capabilities.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
