UX Debt: Import Rule Modal (Copy)

[marrasherrier]

UX Debt from #55753

Import Rules Modal

• The field label text "Select a SIEM rule (as exported from the Detection Engine UI) to import" seems a bit too wordy. Can we change this to "Select a file to import"?
• Likewise, can we change the file picker field's placeholder text to read "Select or drag and drop a file".
• Can we add helpText beneath the file picker field to say File must be a valid signal detection rule saved object (rules_export.ndjson)..
• Can we add an importAction icon to the "Import rule" button (on the left side), as shown in the wireframes?

Rule Updates Callout

• Can we change the header text "Update available for Elastic prebuilt rules" to "Update available for installed Elastic rules"?

• Can we update the message text:
  You can update {updateRules} Elastic prebuilt {updateRules, plural, =1 {rule} other {rules}}. Note that this will reload deleted Elastic prebuilt rules.
  To this text:
  An update is available for {updateRules} installed Elastic {updateRules, plural, =1 {rule} other {rules}}. Please note that updating will also reinstall any previously deleted Elastic rules.

• Can we change the button text:
  Update {updateRules} Elastic prebuilt {updateRules, plural, =1 {rule} other {rules}}
  To this text:
  Update {updateRules} Elastic {updateRules, plural, =1 {rule} other {rules}}