* fix(sync)_: Improve EnableInstallationAndSync and add EnableInstallationV2
- Refactor EnableInstallationAndSync for better error handling and response merging
- Add new EnableInstallationV2 method returning the installation
- Update tests to check for installation in response
- Deprecate old EnableInstallation method
* chore_: remove EnableInstallationV2
* fix(sync)_: create/delete AC notification only when targetInstallationID match
- Add targetInstallationID parameter to SendPairInstallation function
- Update protobuf SyncPairInstallation struct with TargetInstallationId field
- Modify method calls across multiple test files to include new parameter
- Update pairing.proto and pairing.pb.go with new field for local pairing
* chore_: rename stubEnableInstallationAndPair
chore_: move InstallationIDProvider
chore_: revert endpoints.go
test_: check AC with resp
chore_: rename ModifiedInstallationsTargetedToThisDevice
test_: add InstallationIDProvider
chore_: revert endpoints.go
chore_: remove comment
test_: add TestNewInstallationCreatedIsNotDeleted
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