fix: remove loki gateway anti-affinity (#111)

## Description

It was discovered in test that the anti-affinity set on the gateway is
problematic during upgrades. This is partially because we are on a
single node for k3d, but in general the anti-affinity does not make
sense to have here since the gateway is a single replica setup.

## Related Issue

N/A

## Type of change

- [x] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Other (security config, docs update, etc)

## Checklist before merging

- [x] Test, docs, adr added or updated as needed
- [x] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md)(https://github.com/defenseunicorns/uds-template-capability/blob/main/CONTRIBUTING.md#submitting-a-pull-request)
followed

Author: mjnagel

src/loki/values/values.yaml

@@ -110,3 +110,8 @@ monitoring:
     enabled: false
 gateway:
   enabled: true
+  # Remove default anti-affinity since this is a 1-replica setup
+  affinity: ""
+  # Temporary addition to handle upgrade scenarios removing affinity
+  deploymentStrategy:
+    type: Recreate