[oadp-1.5] DPA config for backup repo cache and full maintenance interval (#1705)

[sseago]

cherry-pick of #1705

Why the changes were made

Enable backup repository configuration via DPA. Upstream docs are here: https://velero.io/docs/v1.16/backup-repository-configuration/

This PR adds two new DPA fields to NodeAgentConfig to set cacheLimitMB and fullMaintenanceInterval

How to test the changes made

How to test the changes made

Changes to cacheLimitMB will be reflected in the conf file under $HOME/udmrepo in the velero pod. The number doesn't translate exactly to a single value seen, but for example setting it to 8000 produces these numbers:

  "caching": {
    "cacheDirectory": "../.cache/kopia/2123fc541362ef5f",
    "maxCacheSize": 5368709120,
    "contentCacheSizeLimitBytes": 6710886400,
    "maxMetadataCacheSize": 1342177280,
    "metadataCacheSizeLimitBytes": 1677721600,
    "maxListCacheDuration": 30000000000
  },
Setting it to 4000 will drop all of those numbers except for `maxListCacheDuration` in half.

Also, verify that the `backup-repository-dpa-name` configmap has both fields set (if you set both) and the values match the DPA field valuess:

apiVersion: v1
data:
kopia: '{"cacheLimitMB":2000,"fullMaintenanceInterval":"fastGC"}'
kind: ConfigMap

and that the configmap is passed as an arg to the velero pod:

    - --backup-repository-configmap=backup-repository-velero-sample

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[shubham-pampattiwar]

/lgtm

[mpryc]

/lgtm

[openshift-ci]

@sseago: all tests passed!

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[weshayutin]

/approve /lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mpryc, shubham-pampattiwar, sseago, weshayutin

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