Add Alert Rule Classification Mapping enhancement

[sradco]

This enhancement describes the alert rules classification
mapping details, logic and motivation.

[sradco]

@simonpasquier @avlitman @machadovilaca Hi,
I added this enhancement proposal to outline the mapping of group(updated to layer, to align to incident detection terminology) and component.
Since we had to move operator alerts to an external mapping, I propose here to move it across all alert types.

[simonpasquier]

/unassign @moadz
/assign

[openshift-ci]

@sradco: The specified target(s) for /test were not found.
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/test markdownlint

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/test ci/prow/markdownlint

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[sradco]

/test markdownlint

[openshift-ci]

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[openshift-ci]

@sradco: 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/markdownlint	86158ff	link	true	/test markdownlint

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