Added the test cases for the image in the comment notification.

data/test-cases/plugins/gitlab/subscriptions-and-notifications/Image_in_gitlab_comment.md

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+---
+# (Required) Ensure all values are filled up
+name: "Image attachment properly shown in the comment notification."
+status: Active
+priority: Normal
+folder: Subscriptions-and-notifications
+authors: "@arush-vashishtha"
+team_ownership: []
+priority_p1_to_p4: P2 - Core Functions (Do core functions work?)
+
+# (Optional)
+location: null
+component: null
+tags: []
+labels: []
+tested_by_contributor: null
+
+# (Optional) Test type and tools
+cypress: null
+detox: null
+mmctl: null
+playwright: null
+rainforest: []
+manual_test_environments: []
+
+# Do not change
+id: null
+key: null
+created_on: null
+last_updated: null
+case_hashed: null
+steps_hashed: null
+---
+
+**Step 1**
+
+1. Connect your MM account to Gitlab account.
+2. In the desired channel or DM/GM create subscriptions for `issue_comments` and `merge_request_comments` by using the slash command `/gitlab subscriptions add <owner>/<repo>` on MM.
+3. Navigate to the subscribed repository on Gitlab and add an image in the comments to any desired `issue` or `merge request` on Gitlab.
+4. Navigate to the desired channel or DM/GM on MM.
+
+**Step 2**
+
+1. Connect your MM account to Gitlab account.
+2. In the desired channel or DM/GM create subscriptions for `issue_comments` and `merge_request_comments` by using the slash command `/gitlab subscriptions add <owner>/<repo>` on MM.
+3. Navigate to the subscribed repository on Gitlab and add an embedded image in the comments to any desired `issue` or `merge request` on Gitlab.
+4. Navigate to the desired channel or DM/GM on MM.
+
+**Expected**
+
+The comment notification in the desired channel or DM/GM on MM should show the proper image attached to the desired `issue` or `merge request` on Gitlab.
+After step 2, the comment notification in the desired channel or DM/GM on MM should show the proper embedded image in the comment on desired `issue` or `merge reuest` on Gitlab.