Adds --helmrelease-interval (default 5m, matching today's behaviour) to the
operator and a corresponding cozystackOperator.helmReleaseInterval value
on the cozy-installer chart (default empty -> no flag rendered ->
operator default 5m applies).
E2E install sets it to 30s. Rationale: with the 5m default, dependency-
blocked HRs (waiting on cert-manager webhooks, CRDs) are requeued only
every 5 min, producing an 8-10 min dead zone in the E2E install where
the fast pack of HRs is Ready but the slow tail hasn't been retried yet.
30s collapses the gap.
Production defaults are unchanged. The override is opt-in per install.
Signed-off-by: Myasnikov Daniil <myasnikovdaniil2001@gmail.com>