Why does Omniknight have 62 shovels?

The ESL One Birmingham Dota 2 tournament is now underway, and while watching some of the games I noticed new icons above the usual hero abilities in-game.

Specifically, there's a row of 6 new icons or buttons above each hero's QWER skills. The first four icons have numbers next to them which seem to vary from hero to hero. Here's an example I took from a recent game:

What are all of these new icons and what do they mean?

Those are consumable items and actions available with purchase of The International Battlepass 2019.
From left to right, they are:

• Trusty Shovel, used to dig up treasures such as Battle Points or the "cosmically-rare" Honey Heist Baby Roshan courier.
• Silly Monkey, which cheers for the player's last hits and denies, and flings poo at enemy heroes attacking the player (purely cosmetic).
• War Drums, which plays a sound when attacked. Note that this item can currently activate on-hit effects such as Templar Assassin's Psi Blades spilling, and Enigma's Eidolon's multiplication, so it is usually banned in tournaments.
• Snake Balloon, which floats around and bounces away from heroes.
• High Five; exactly what it sounds like. Can be used with allies or enemies.
• Avatar Banner, which plants a banner with an image of the player's hero or Steam avatar.