Update RBAC in Helm template

[ciarams87]

Proposed changes
Updating the Helm RBAC template with cert-manager permissions was missed in the original PR.

Also update example to use latest cert-manager deployment yaml.

[codecov-commenter]

Codecov Report

Merging #2593 (b448611) into main (192c76f) will decrease coverage by 0.08%.
The diff coverage is 38.88%.

@@            Coverage Diff             @@
##             main    #2593      +/-   ##
==========================================
- Coverage   53.53%   53.44%   -0.09%     
==========================================
  Files          52       52              
  Lines       14691    14696       +5     
==========================================
- Hits         7865     7855      -10     
- Misses       6568     6579      +11     
- Partials      258      262       +4     

Impacted Files	Coverage Δ
cmd/nginx-ingress/main.go	6.86% <0.00%> (-0.06%)	⬇️
internal/configs/config_params.go	76.74% <ø> (ø)
internal/configs/version1/config.go	0.00% <ø> (ø)
internal/k8s/controller.go	10.87% <20.00%> (ø)
internal/configs/configmaps.go	18.22% <100.00%> (ø)
pkg/apis/configuration/validation/policy.go	94.42% <100.00%> (-2.13%)	⬇️
internal/k8s/configuration.go	95.47% <0.00%> (-0.39%)	⬇️
...ternal/k8s/appprotect/app_protect_configuration.go	86.74% <0.00%> (+0.57%)	⬆️

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