feat(helm): add namespaceOverride

[jkroepke]

What this PR does / why we need it:

Allow overriding namespace for Loki helm chart resources.

Which issue(s) this PR fixes:

• Fixes Helm chart should template namespace #8044
• Fixes feat(loki-helm): allow override namespace for loki helm chart #11989
• Fixes feat: Add support for Helm namespaceOverride #12321

Special notes for your reviewer:

Checklist

• Reviewed the CONTRIBUTING.md guide (required)
• Documentation added
• Tests updated
• Title matches the required conventional commits format, see here
  • Note that Promtail is considered to be feature complete, and future development for logs collection will be in Grafana Alloy. As such, feat PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.
• Changes that require user attention or interaction to upgrade are documented in docs/sources/setup/upgrade/_index.md
• If the change is deprecating or removing a configuration option, update the deprecated-config.yaml and deleted-config.yaml files respectively in the tools/deprecated-config-checker directory. Example PR

[jkroepke]

@QuentinBisson 👀

[QuentinBisson]

LGTM but that was not a fun review 😂

[QuentinBisson]

@jkroepke can you fix the conflicts?

[jkroepke]

Done

[Jayclifford345]

Hi team, I am currently getting a helm CI issue for this PR:

Installing chart with values file "production/helm/loki/ci/non-default-values.yaml"...

Creating namespace "loki-u8zjw0ktrj"...
namespace/loki-u8zjw0ktrj created
Error: INSTALLATION FAILED: namespaces "loki" not found
========================================================================================================================
........................................................................................................................
==> Events of namespace loki-u8zjw0ktrj
........................................................................................................................
No resources found in loki-u8zjw0ktrj namespace.
........................................................................................................................
<== Events of namespace loki-u8zjw0ktrj
........................................................................................................................
========================================================================================================================
Deleting release "loki-u8zjw0ktrj"...
release "loki-u8zjw0ktrj" uninstalled
Deleting namespace "loki-u8zjw0ktrj"...
namespace "loki-u8zjw0ktrj" deleted
Namespace "loki-u8zjw0ktrj" terminated.
Error: failed installing charts: failed processing charts

------------------------------------------------------------------------------------------------------------------------
 ✖︎ loki => (version: "6.36.1", path: "production/helm/loki") > failed waiting for process: exit status 1
------------------------------------------------------------------------------------------------------------------------
failed installing charts: failed processing charts
Error: Process completed with exit code 1.

[jkroepke]

@Jayclifford345 please trigger the CI again

[Jayclifford345]

LGTM