[release-v0.18] Change metrics names

[assafad]

Manual cherrypick of #643.

Release note:

Deprecation notice for the metrics listed in the PR. They will be removed in this release. Please update your systems to use the new metrics names.
ssp_operator_reconciling_properly -> kubevirt_ssp_operator_reconcile_succeeded
kubevirt_ssp_num_of_operator_reconciling_properly -> kubevirt_ssp_operator_reconcile_succeeded_aggregated
total_rejected_vms -> kubevirt_ssp_template_validator_rejected_total
kubevirt_ssp_rejected_vms_total -> kubevirt_ssp_template_validator_rejected_increase
total_restored_common_templates -> kubevirt_ssp_common_templates_restored_total
kubevirt_ssp_common_templates_restored_total -> kubevirt_ssp_common_templates_restored_increase
Kubevirt_ssp_template_validator_up_total -> kubevirt_ssp_template_validator_up
Kubevirt_ssp_operator_up_total -> kubevirt_ssp_operator_up

[assafad]

/cc @akrejcir

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
2 Code Smells

No Coverage information
0.0% Duplication

[akrejcir]

/lgtm
/approve

[kubevirt-bot]

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