Slow down accounts creation to make it more stable

Piotr Batkorequested to merge
pbatko/fix-ci-random-fail into master

Account creation at CI was failing from time to time. Reasons of fail were:

  1. "Unable to acquire database lock" error
  2. Exceeded size of transactions
  3. Transactions expiration

Reduction of operations number in transaction solves problem with (2). Reduced server work load (by both changes) mitigates problems with (1) and solves (3).

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