fix(argocd-image-updater): escape Go template syntax in CRD descriptions

## What

Re-escape the `{{ .app.path.path }}` placeholders inside the writeBackTarget description fields of crd-imageupdaters.yaml so Helm emits them literally instead of evaluating them as template expressions.

## Why

The v1.2.0 CRD sync removed the prior Helm escape wrapper, leaving upstream's literal `{{ .app.path.path }}` text in the YAML descriptions. Helm parses the entire template through Go templates before YAML, so it tried to evaluate `.app.path.path` against the chart context and failed with a nil-pointer error during chart-test lint with ci/enable-extra-objects-values.yaml.

## Notes

- Renovate may overwrite this fix the next time it regenerates this branch; if so the same escape will need to be reapplied.
- Uses the backtick raw-string escape `{{`...`}}` so the rendered output matches the upstream CRD verbatim, with no surrounding quotes (versus the prior `{{ quote ... }}` form).
- A second occurrence at the per-image override level had the same regression and is fixed identically.

Signed-off-by: jmeridth <[email protected]>

Author: jmeridth

charts/argocd-image-updater/templates/crd-imageupdaters.yaml

@@ -358,7 +358,7 @@ spec:
                               description: |-
                                 WriteBackTarget defines the path and type of file to update in the Git repository.
                                 Examples: "helmvalues:./helm/values.yaml", "kustomization:./kustomize/overlays/production".
-                                For ApplicationSet usage, `{{ .app.path.path }}` should be resolved by ApplicationSet
+                                For ApplicationSet usage, `{{`{{ .app.path.path }}`}}` should be resolved by ApplicationSet
                                 before this CR is generated, resulting in a concrete path here.
                                 Required if write-back method is Git and this is not specified at the spec level.
                               type: string
@@ -476,7 +476,7 @@ spec:
                         description: |-
                           WriteBackTarget defines the path and type of file to update in the Git repository.
                           Examples: "helmvalues:./helm/values.yaml", "kustomization:./kustomize/overlays/production".
-                          For ApplicationSet usage, `{{ .app.path.path }}` should be resolved by ApplicationSet
+                          For ApplicationSet usage, `{{`{{ .app.path.path }}`}}` should be resolved by ApplicationSet
                           before this CR is generated, resulting in a concrete path here.
                           Required if write-back method is Git and this is not specified at the spec level.
                         type: string