OSD-22394 osdctl alert silence --all does not silence

[itsmitul9]

• Fixed issue for making all alerts silenced using --all
• Refactored code
• Silence list display namespace in AlertName
• Using namespace matcher to alert all silence

[AlexVulaj]

Some thoughts as I look over this PR:

• ExecWithPod should take a "namespace" as a parameter and be moved to a more generic "utils" package, as it's a useful command all around and doesn't have any logic specific to alerts.
• ExecInPod should have a more specific name, maybe something like "ExecInAlertManagerPod", and a more descriptive comment to go along with that. Right now it's unclear to someone looking at the function name and comments that it will try on both AlertManager pods specifically.

[openshift-ci]

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[devppratik]

/lgtm

[AlexVulaj]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AlexVulaj, devppratik, itsmitul9

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