Make get_latest_konflux_build() consistent with get_latest_brew_build()

[adobes1]

Currently get_latest_konflux_build() and get_latest_brew_build() behave differently when no build is found. Brew raises a clear IOError with default=-1, while Konflux returns None with default=None. This causes issues where code expects both to behave the same way.

This changes Konflux to match Brew's behavior: default to -1 and raise IOError when no build is found. Callers that explicitly want None returned (without raising IOError) now pass default=None. The PR also updates affected files to maintain existing functionality.

[openshift-ci]

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[openshift-ci]

@adobes1: The following test 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/security	538325f	link	false	/test security

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[locriandev]

I am a little concerned about changing this behavior, unless we're assessed that it is ok for a IOError to be raised in such cases. Another approach might be using a strict param as defined in https://github.com/openshift-eng/art-tools/blob/main/artcommon/artcommonlib/konflux/konflux_db.py#L282.

Last, I would like we make sure that there is no place where we do things like if build:, which would evaluate to False in case we return None, to True if we return -1.