Replace hardcoded NS in KUTTL with variable

[abays]

DESIGNATE_KUTTL_NAMESPACE is user-configurable in install_yamls (via ?= assignment), but test scripts and asserts had "designate-kuttl-tests" hardcoded in databaseHostname assertions. Tests would fail when run with a non-default namespace.

Replace all hardcoded namespace references with the $NAMESPACE env var that KUTTL provides to test scripts. Specifically, for databaseHostname validation, switch from static YAML asserts to script-based checks that dynamically construct the expected value.

Co-Authored-By: Claude Opus 4.6 noreply@anthropic.com

[openshift-ci]

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/test functional

[abays]

@abays: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:
Test name Commit Details Required Rerun command
ci/prow/functional 064fe88 link true /test functional
ci/prow/designate-operator-build-deploy-kuttl 064fe88 link true /test designate-operator-build-deploy-kuttl

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Details

KUTTL failure does not seem related to this PR's particular KUTTL changes, but might be:

case.go:380: command "tupleTemplate='{{ range (index .spec.template.spec.containers 0).en..." exceeded 2 sec timeout, context deadline exceeded

Will try again and see what happens.

/test designate-operator-build-deploy-kuttl