store: Pod anti affinity to distribute stores across nodes

[brancz]

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

Pod anti affinity for stores.

Verification

Validated with kubectl validate against a kind cluster.

[metalmatze]

Nice. As it's preferred it shouldn't hurt to add it to the other components too. :)

[brancz]

As it's preferred it shouldn't hurt to add it to the other components too. :)

Agreed. I also found that the receive component actually does it too aggressively today, it performs anti affinity with everything in the stack. Additional PR coming for that.