feat: rework codebase using universal addon

[jaygridley]

Description

Breaking Changes

• Change code base to use universal addon as template
• Update KEDA to 2.14. This version changes how Service Accounts are created resulting in a change of input variables. Now the inputs might be scoped to individual KEDA components - operator (keda_operator_*), metrics server (keda_metric_server_*) and webhooks (keda_webhooks_*).

Migration guide

You can either leave all IRSA related variables and only rename irsa_policy_allow_assume_roles to irsa_assume_role_arns as is resulting in all 3 new Service Accounts to have the same configuration or you can decide to remove them and add a new set of corresponding variables for individual components, see variables.tf for a reference.

Type of change

• A bug fix (PR prefix fix)
• A new feature (PR prefix feat)
• A code change that neither fixes a bug nor adds a feature (PR prefix refactor)
• Adding missing tests or correcting existing tests (PR prefix test)
• Changes that do not affect the meaning of the code like white-spaces, formatting, missing semi-colons, etc. (PR prefix style)
• Changes to our CI configuration files and scripts (PR prefix ci)
• Documentation only changes (PR prefix docs)

How Has This Been Tested?

• Used this PR branch as a source for LARA addon test and installed KEDA, checked its deployment status

[dojci]

LGTM

[dojci]

Missing IRSA mandatory features:

• aws_partition
• permission boundaries

[dojci]

LGTM