SALTO-6172 - Salesforce: extract references from certain LightningPage fields

[tomsellek]

LightningPage.flexiPageRegions.itemInstances.componentInstances.componentInstanceProperties may contain references to QuickAction when the name value is "actionNames".
e.g.

salesforce.LightningPage SomePage {
  flexiPageRegions = [
    {
      itemInstances = [
        {
          componentInstance = {
            componentInstanceProperties = [
              {
                name = "actionNames"
                valueList = {
                  valueListItems = [
                    {
                      value = "Global.NewTask"
                    },
                    {
                      value = "Opportunity.SomeQuickAction"
                    },
                ]
            }
    ...

---

This PR is built on top of #6216
Tests: Created a Lightning page with a global QuickAction and verified it becomes a reference after a fetch.
Workspace diff: https://github.com/salto-io/tomsellek-sf-6172/pull/1/files

---

Release Notes:
Salesforce: Will now generate more references from LightningPage elements

---

User Notifications:
Salesforce: Will now generate more references from LightningPage elements

[coveralls]

coverage: 93.804% (-0.006%) from 93.81%
when pulling f689e80 on tomsellek:tom-sellek.SALTO-6172.formula-refs-from-lightningpage
into aa88efd on salto-io:main.