MDL-87095 mod_lesson: add behat test for importing questions into lesson

public/mod/lesson/tests/behat/import_questions.feature

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+@mod @mod_lesson @_file_upload
+Feature: Teacher can import questions into a lesson activity
+
+  Background:
+    Given the following "users" exist:
+      | username | firstname | lastname | email                |
+      | teacher1 | Teacher   | One      | teacher1@example.com |
+    And the following "courses" exist:
+      | fullname | shortname |
+      | Course 1 | C1        |
+    And the following "course enrolments" exist:
+      | user     | course | role           |
+      | teacher1 | C1     | editingteacher |
+    And the following "activities" exist:
+      | activity | name          | course |
+      | lesson   | Import lesson | C1     |
+
+  @javascript
+  Scenario: Teacher imports questions using Moodle XML (image is displayed)
+    Given I am on the "Import lesson" "lesson activity" page logged in as "teacher1"
+    And I follow "Import questions"
+    And I set the field "File format" to "Moodle XML"
+    When I upload "mod/lesson/tests/fixtures/multichoice.xml" file to "Upload" filemanager
+    And I press "Import"
+    And I press "Continue"
+    Then I should see "Lesson is currently being previewed."
+    And "//img[contains(@src, 'pluginfile.php')]" "xpath_element" should exist
+    And I press "Edit page contents"
+    And I set the field "Page contents" to "Edited page contents"
+    And I press "Save page"
+    And I should see "Edited page contents"
+
+  @javascript
+  Scenario: Teacher imports questions using GIFT (images are not displayed)
+    Given I am on the "Import lesson" "lesson activity" page logged in as "teacher1"
+    And I follow "Import questions"
+    And I set the field "File format" to "GIFT"
+    When I upload "mod/lesson/tests/fixtures/lesson_import_questions.gift" file to "Upload" filemanager
+    And I press "Import"
+    And I press "Continue"
+    Then I should see "Lesson is currently being previewed."
+    And "//img[contains(@src, 'pluginfile.php')]" "xpath_element" should not exist
+    And I press "Edit page contents"
+    And I set the field "Page contents" to "Edited page contents"
+    And I press "Save page"
+    And I should see "Edited page contents"

public/mod/lesson/tests/fixtures/lesson_import_questions.gift

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+::MC question::
+What is 2 + 2?
+<img src="example.png" alt="Example image">
+{
+=4
+~3
+}
+
+::Essay question::
+Describe something.
+<img src="example.png" alt="Example image">
+{}