Added replaceAll support for go templates

[fabriziofiorucci]

Proposed changes

Enabled support for replaceAll in go templates

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• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
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[haywoodsh]

It could be potentially confusing for the users since this PR makes changes to helper functions in internal/configs/version2 but the docs are for ingress template only.

Helper functions can be used in the Ingress template to parse the values of custom annotations.
https://github.com/nginxinc/kubernetes-ingress/pull/5468/files#diff-41a03d28be17f49b16b7644d03d1dafb5073b6aee2ffafe099446b1649dba1cfR103

Until we change the page's wording or move it to a better location, I would suggest following this PR #4560 and add the replaceAll function to both version1 and version2

I also think we should add a test case for the function to template_helper_test.go in both version1 and version2 like the PR mentioned above