feat: add pattern validation for string array items in blueprint resource

[devin-ai-integration]

Add pattern validation for string array items in blueprint resource

This PR adds support for pattern validation in string array items, bringing parity with the existing pattern validation in string properties.

Changes

• Added pattern field to StringItems struct in model.go
• Added pattern schema attribute to string_items in schema.go
• Updated array property tests to verify pattern validation

Example Usage

resource "port_blueprint" "regex" {
  properties = {
    array_props = {
      "stringArrayProp" = {
        string_items = {
          pattern = "^[a-zA-Z0-9]*$"
        }
      }
    }
  }
}

Testing

• Added test case in TestAccPortBlueprintArrayProperty
• CI will run acceptance tests to verify the changes

Link to Devin run: https://app.devin.ai/sessions/dadd4fe884b349059f2308a19d705996

[devin-ai-integration]

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[erikzaadi]

You'll need to manually run make gen-docs once and add the changed markdown files

[erikzaadi]