[velero] Add paused flag for the schedule resource

[higashik]

Special notes for your reviewer:

I implemented the paused flag supported by the Schedule API type so that it can be specified in schedules: in Helm chart's values.yaml.

I think this implementation will achieve what was expected in a this issue : #462 .

Checklist

[Place an '[x]' (no spaces) in all applicable fields. Please remove unrelated fields.]

• [x] DCO signed
• [x] Chart Version bumped, please refer to the chart version instruction
• [x] Variables are documented in the values.yaml or README.md
• [x] Title of the PR starts with chart name (e.g. [velero])

[jenting]

Hi, could you please help resolve the conflicts? Thanks.

[higashik]

Hi, could you please help resolve the conflicts? Thanks.

Thank you for your guidance. The conflict has been resolved.