Add Alert Rule Classification Mapping enhancement

[sradco]

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

This enhancements is related to #1822

[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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[sradco]

/test markdownlint

[openshift-ci]

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Test name	Commit	Details	Required	Rerun command
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