helm: update mimir-distributed to 6.0.0-rc.0 with Mimir 3.0.0 (#13078)

Update mimir-distributed Helm chart to version 6.0.0-rc.0 with Mimir
3.0.0.

This updates:
- Chart version to 6.0.0-rc.0
- Mimir image tag to 3.0.0
- Documentation references to Mimir v3.0.x
- Deploy preview workflow to use Mimir v3.0.x docs

Release mimir-distributed Helm chart 5.9.0-weekly.365 (#13061)

Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

Co-authored-by: krajorama <krajorama@users.noreply.github.com>

v3.0.0-rc.0

Release mimir-distributed Helm chart 5.9.0-weekly.364 (#12985)

Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

Co-authored-by: krajorama <krajorama@users.noreply.github.com>

Release mimir-distributed Helm chart 5.9.0-weekly.363 (#12914)

Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

Co-authored-by: krajorama <krajorama@users.noreply.github.com>

Release mimir-distributed Helm chart 5.9.0-weekly.361 (#12781)

Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

Co-authored-by: krajorama <krajorama@users.noreply.github.com>

Release mimir-distributed Helm chart 5.9.0-weekly.360 (#12717)

Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

Co-authored-by: krajorama <krajorama@users.noreply.github.com>

Release mimir-distributed Helm chart 5.9.0-weekly.359 (#12651)

Automated PR created by
[helm-weekly-release-pr.yaml](https://github.com/grafana/mimir/blob/main/.github/workflows/helm-weekly-release-pr.yaml)

Co-authored-by: krajorama <krajorama@users.noreply.github.com>

v2.17.1

helm: bump minor version (#12575)

#### What this PR does

Following #12039

I've noticed that in the 2.17 release, post releasing the Helm chart
5.8.0, when we [merged the release back
to](#12455) the `main` branch, the
merge commit didn't update the chart's `Chart.yaml` manifest with the
release version. This confused the CI that bumps the weekly release.

In this PR I'm manually bumping the Helm chart minor release to
5.9.0-weekly.XXX. This will make sure that all future weekly releases
will get marked as more recent than the 5.8.0. That is, note in the list
below that the `5.8.0` is the latest release, even though, _technically_
the `5.8.0-weekly.357` is the most recent one.

```
helm search repo grafana/mimir-distributed -l --devel

NAME                     	CHART VERSION         	APP VERSION	DESCRIPTION
grafana/mimir-distributed	5.8.0                 	2.17.0     	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.339-dev.2	r339       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.357      	r357       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.356      	r356       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.355      	r355       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.354      	r354       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.353      	r353       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.352      	r352       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.350      	r350       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.347      	r347       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.346      	r346       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.343      	r343       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.341      	r341       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.339      	r339       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.338      	r338       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.337      	r337       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.336      	r336       	Grafana Mimir
grafana/mimir-distributed	5.8.0-weekly.335      	r335       	Grafana Mimir
grafana/mimir-distributed	5.8.0-rc.0            	2.17.0-rc.1	Grafana Mimir
grafana/mimir-distributed	5.7.0                 	2.16.0     	Grafana Mimir
```

Note (2), above, the `grafana/mimir-distributed 5.8.0-weekly.339-dev.2`
was from my manually testing, that messed up the ordering further. I'm
not rushing to fix that.

Signed-off-by: Vladimir Varankin <vladimir.varankin@grafana.com>