Feat: Add admission controller

[ctolon22]

Description

Add support for installing SCC-WP Admission Controller:

• Webhook
• KSPM admission controller

It's disabled by default

It requires adding Sysdig API Token when used.

Release required?

• [ ] No release
• [ ] Patch release (x.x.X)
• [ x] Minor release (x.X.x)
• [ ] Major release (X.x.x)

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[ctolon22]

Left some comments - is there a reason why we would not enable the admission controller by default?

As it requires the API Token, I would like to reduce what customers need to introduce and only use it if they actually want it. When moving to cluster-shield / host-shield later this year, we'll enable it by default as the Token requirement will not be necessary anymore

Fixing now the rest of comments

[ocofaigh]

/run pipeline

[ocofaigh]

@ctolon22 Test failed with this:

│ Error: Missing required argument
│ 
│   with module.scc_wp_agent.helm_release.scc_wp_agent,
│   on ../../main.tf line 36, in resource "helm_release" "scc_wp_agent":
│   36: resource "helm_release" "scc_wp_agent" {
│ 
│ The argument "set.40.value" is required, but no definition was found.
╵}

[ocofaigh]

@ctolon22 we probably also want to update the example that the test runs to actually deploy the admission controller so that we test it in PRs