[release-2.1] Backport #1514

The multiListerWatcher is a composite object encapsulating multiple
ListerWatchers and implements the ListerWatcher interface.
With the current implementation, when an individual lister fails, the
entire List operation fails. This causes no metrics to be shown when KSM
has no permissions to a single namespace.

In addition to this, the multiListerWatcher takes advantage of internal
implementation details if the client-go library by modifiying and
relying on the ResourceVersion metadata field. This introduces a bug
where reconnecting to the API server will break the multiListerWatcher
completely.

This commit replaces the multiListerWatcher with individual
ListerWatchers per each configured namespace, resolving both issues.

Signed-off-by: fpetkovski <filip.petkovsky@gmail.com>

Co-authored-by: Damien Grisonnet <damien.grisonnet@epita.fr>

Co-authored-by: Manuel Rüger <manuel@rueg.eu>

Signed-off-by: FillZpp <FillZpp.pub@gmail.com>

Signed-off-by: Manuel Rüger <manuel@rueg.eu>

* [CHANGE] Replace multiListWatcher with independent listWatchers per namespace #1499
* [CHANGE] go.mod: Update and minimize dependencies #1529
* [BUGFIX] Use BuilderInterface instead of internal/store.Builder in metricshandler #1537
* [BUGFIX] Add WithAllowLabels to public BuilderInterface #1514

Cherry pick for v2.1.1 / Cut Release

Signed-off-by: Damien Grisonnet <dgrisonn@redhat.com>

CHANGELOG: apply changes for v2.1.1

[release-2.1] Backport #1610