Fix Slack channel to use saas configured channel

[YiqinZhang]

Fixes Slack notifications going to the default channel instead of the team configured one. sendFailureNotification now falls back to SLACK_CHANNEL when LOG_ANALYSIS_SLACK_CHANNEL is unset, so each SaaS target can control its notification channel via the existing SLACK_CHANNEL parameter.

SDCICD-1758

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/pipeline required

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Scheduling required tests:
/test hypershift-pr-check

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@YiqinZhang: 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/hypershift-pr-check	cf88553	link	true	/test hypershift-pr-check

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