Most of the handlers there support all git forges now.

It will support Gitlab as well.

See handlers/__init__.py to know what is where now
i.e.

from packit_service.worker.handlers.abstract import (
    Handler,
    JobHandler,
    FedmsgHandler,
)
from packit_service.worker.handlers.copr_handlers import (
    CoprBuildHandler,
    CoprBuildEndHandler,
    CoprBuildStartHandler,
)
from packit_service.worker.handlers.distgit_handlers import (
    DistGitCommitHandler,
    ProposeDownstreamHandler,
)
from packit_service.worker.handlers.forges_handlers import (
    GithubAppInstallationHandler,
    PullRequestLabelHandler,
)
from packit_service.worker.handlers.koji_handlers import (
    KojiBuildHandler,
    KojiBuildReportHandler,
)
from packit_service.worker.handlers.testing_farm_handlers import (
    TestingFarmHandler,
    TestingFarmResultsHandler,
)

It's been renamed from PagurePullRequestLabelHandler
and reacts to MergeRequestGitlabEvent
(which now has also source_repo_branch & target_repo_branch attributes).

Creating a Bugzilla bug is no longer a reaction to added label,
but triggered by opening a new MR and is
now restricted to set of allowed namespaces and branches.

The now unused code for handling labels on Pagure has been removed.