chore(ci): fix sanity checks & re-enable audit-log for showcase

[zdrapela]

Description

This changes how sanity check plugins are loaded into NAME_SPACE_SANITY_PLUGINS_CHECK deployment. By merging the file with the base one, we should avoid conflicts with duplicate configurations of the plugins.
It uses the logic from here:

rhdh/.ibm/pipelines/utils.sh

Lines 192 to 216 in ff282f6

	# Merge the base YAML value file with the differences file for Kubernetes
	yq_merge_value_files() {
	local base_file=$1
	local diff_file=$2
	local step_1_file="/tmp/step-without-plugins.yaml"
	local step_2_file="/tmp/step-only-plugins.yaml"
	local final_file=$3
	# Step 1: Merge files, excluding the .global.dynamic.plugins key
	# Values from `diff_file` override those in `base_file`
	yq eval-all '
	select(fileIndex == 0) * select(fileIndex == 1) |
	del(.global.dynamic.plugins)
	' "${base_file}" "${diff_file}" > "${step_1_file}"
	# Step 2: Merge files, combining the .global.dynamic.plugins key
	# Values from `diff_file` take precedence; plugins are merged and deduplicated by the .package field
	yq eval-all '
	select(fileIndex == 0) *+ select(fileIndex == 1) |
	.global.dynamic.plugins |= (reverse | unique_by(.package) | reverse)
	' "${base_file}" "${diff_file}" > "${step_2_file}"
	# Step 3: Combine results from the previous steps and remove null values
	# Values from `step_2_file` override those in `step_1_file`
	yq eval-all '
	select(fileIndex == 0) * select(fileIndex == 1) | del(.. | select(. == null))
	' "${step_2_file}" "${step_1_file}" > "${final_file}"
	}

Which issue(s) does this PR fix

• Fixes RHIDP-6083

PR acceptance criteria

Please make sure that the following steps are complete:

• GitHub Actions are completed and successful
• Unit Tests are updated and passing
• E2E Tests are updated and passing
• Documentation is updated if necessary (requirement for new features)
• Add a screenshot if the change is UX/UI related

How to test changes / Special notes to the reviewer

[zdrapela]

/test

[openshift-ci]

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[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests-nightly

[zdrapela]

/test e2e-tests

[zdrapela]

/test e2e-tests

[gustavolira]

/lgtm

[openshift-ci]

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