Acceptance test steps for public link share

[phil-davis]

Description

Hide the magic link share numbers from the gherkin test code
Add steps to specifically create pubic link shares
Call them "public link share" rather than just "public share" or whatever else they were called.

Note: to-do some day, hide the magic for share type 0 (share with a user) and 1 (share with a group).

Motivation and Context

Acceptance test steps for shares have a lot of tests that mention shareType with "magic numbers" 0, 1, 3.
Type 3 is a public link share. Hide this magic, and hopefully make the test steps more readable.

How Has This Been Tested?

CI

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:

Open tasks:

• Backport (if applicable set "backport-request" label and remove when the backport was done)

[phil-davis]

Backport stable10 #32740