Fix resource requests/limits for KMC

[mfaizanse]

Seems like the resource overrides for KMC are not working.

There is no resource limit defined in KMC pod in all control-planes: dev+stage+prod:

╰─ k get deploy -n kcp-system kcp-kyma-metrics-collector -o jsonpath='{.spec.template.spec.containers}' | jq '.[] | select(.name=="kyma-metrics-collector").resources'
{}

AC(s):

• [x] Fix the overrides and make sure the resources requests+limits are defined for KMC container.
• [x] Adjust the memory and cpu requests+limits as required by the new changes in KMC. Take a look into current usage by existing KMC pods.