Adds support for `options` in inputs

What does this MR do and why?

Adds support for options in inputs.

Changelog: added

Screenshots or screen recordings

With the following spec: inputs

spec:
  inputs:
    environment:
      default: staging
      options: [staging, test, production]

With the default value of staging :

With a value selected from options:

ERRORS

When trying to define a default that is not in the options array:

spec:
  inputs:
    environment:
      default: kitten
      options: [staging, test, production]

Wjemn trying to utilize a default that is not in the options:

When trying to utilize a value that is not in the predefined options array:

How to set up and validate locally

In a project marked as a catalog resource, add the following spec: inputs

spec:
  inputs:
    environment:
      default: staging
      options: [staging, test, production]
---    
inputs_job:
  script: echo "$[[inputs.environment]]"

There should be four use cases tested here, as shown in the screenshots above.

1. Default value - environment:
2. Options value - environment: anyvaluefromarray
3. Error 1 - try to use another value that is not in the array for a default value default: kitten
4. Error 2 - try to use a value that is not in the array environment: not-in-array

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Resolves: #393401 (closed)