Fixes #37612 - Fix deletion of Ansible variables from Host page

[nofaralfasi]

• Use isEqual for deep comparison when matching variable values,
  ensuring correct behavior during variable deletion.
• Add defaultValue field to GraphQL mutation, for proper value display
  after Ansible variable deletion.

[Thorben-D]

Looks like a sensible change but I can't test it unfortunately, as I am not sure how to reproduce the issue.

[nofaralfasi]

Looks like a sensible change but I can't test it unfortunately, as I am not sure how to reproduce the issue.

I added the steps to reproduce this bug - https://projects.theforeman.org/issues/37612#note-2

[Thorben-D]

Thank you for adding the reproducer!
I tested it and can confirm that the deletion of overrides is now working.
I did however notice a different issue:
TypeError: Cannot read properties of null (reading 'value') at AnsibleVariableOverridesTableHelper.js:52:59

This happens because the OverridenAnsibleVariablePresenter returns nil for the current_value field, as the override has just been deleted.
This then breaks this function, which is used to set the text of the "Value" and "Edit" field. Right now, the edit field still retains the override-value after deletion.

[stejskalleos]

@MariaAga review please

[MariaAga]

lgtm

[stejskalleos]

Thanks @nofaralfasi @Thorben-D @MariaAga