[MODERATION] organization blocking a user (#802)

- Resolves #476
- Follow up for: #540
- Ensure that the doer and blocked person cannot follow each other.
- Ensure that the block person cannot watch doer's repositories.
- Add unblock button to the blocked user list.
- Add blocked since information to the blocked user list.
- Add extra testing to moderation code.
- Blocked user will unwatch doer's owned repository upon blocking.
- Add flash messages to let the user know the block/unblock action was successful.
- Add "You haven't blocked any users" message.
- Add organization blocking a user.

Co-authored-by: Gusted <postmaster@gusted.xyz>
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/802
(cherry picked from commit 0505a10421)

services/user/block.go

@@ -6,6 +6,7 @@ import (
 	"context"
 
 	"code.gitea.io/gitea/models/db"
+	repo_model "code.gitea.io/gitea/models/repo"
 	user_model "code.gitea.io/gitea/models/user"
 )
 
@@ -30,11 +31,28 @@ func BlockUser(ctx context.Context, userID, blockID int64) error {
 		return err
 	}
 
-	// Unfollow the user from block's perspective.
+	// Unfollow the user from the block's perspective.
 	err = user_model.UnfollowUser(ctx, blockID, userID)
 	if err != nil {
 		return err
 	}
 
+	// Unfollow the user from the doer's perspective.
+	err = user_model.UnfollowUser(ctx, userID, blockID)
+	if err != nil {
+		return err
+	}
+
+	// Blocked user unwatch all repository owned by the doer.
+	repoIDs, err := repo_model.GetWatchedRepoIDsOwnedBy(ctx, blockID, userID)
+	if err != nil {
+		return err
+	}
+
+	err = repo_model.UnwatchRepos(ctx, blockID, repoIDs)
+	if err != nil {
+		return err
+	}
+
 	return committer.Commit()
 }