(Enhancement) Add "Review Required" Identifier on Pull Requests Targeting Protected Branches with Required Approvals

[bagasme]

• Gitea version (or commit ref): 1.9.0
• Git version: 2.17.1
• Operating system: Ubuntu 18.04
• Database (use [x]):
  • PostgreSQL
  • MySQL
  • MSSQL
  • SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • Yes (provide example URL)
  • No
  • Not relevant (I couldn't access because of slow internet connection)
• Log gist:
  (not relevant)

Description

In Pull Requests tab of Gitea repository, there isn't Review Required text next to who and when the pull request that merge into protected branch with required approvals setting was made. Thus, users don't know whether a PR requires reviews/approvals without having to click into individual PR link.

Screenshots

This screenshot below is from my localhost Gitea instance on my computer. I created learnPRHomework repository and set master branch protected with 1 required approval. Other user (bagas) open a pull request to this protected branch. Note that there isn't Review Required text as described in the description above:

On the other hand, PR on GitHub with similar condition have Review Required text (the screenshot is from linode-docs PRs:

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 weeks. Thank you for your contributions.

[6543]

I couldn't find the specific pull but its arlready implemented: