[feat webhook]: Templating failurePolicy value from all webhooks

[pachecoc]

Description

Templating the value of failurePolicy of all webhooks in order to add the flexibility to them. Default value is kept as Fail as it was hardcoded before.

In addition to that, variables related to failurePolicy were added in the README.md file.

Checklist

• [X] Added tests that cover your change (if possible)
• [X] Added/modified documentation as required (such as the README.md, or the docs directory)
• [X] Manually tested
• [X] Made sure the title of the PR is a good description that can go into the release notes

BONUS POINTS checklist: complete for good vibes and maybe prizes?! :exploding_head:

• [ ] Backfilled missing tests for code in same general area :tada:
• [ ] Refactored something and made the world a better place :star2:

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: pachecoc / name: Gustavo Pacheco (ee6b5582e5516d55490532483e9724d72d559e9c)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: pachecoc, zac-nixon

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