Job / Pod specs of jobs should be configurable

[monotek]

Describe the problem/challenge you have

When Velero runs maintenance or backup jobs the pod spec is not configurable. As we have a lod of nodes which make use of taints these workloads can't be scheduled there.

Describe the solution you'd like

We would need to adjust the tolerations and affinites for such jobs. Therefore the whole job / pod template should be configurable (we also woud like to be able to configure other stuff like securtiycontexts, job history and so on).

Anything else you would like to add:

Environment:

• Velero version (use velero version):

 velero version
Client:
	Version: v1.14.0
	Git commit: 2fc6300f2239f250b40b0488c35feae59520f2d3
Server:
	Version: v1.14.0

• Velero features (use velero client config get features):

velero client config get features
features: <NOT SET>

• Kubernetes version (use kubectl version):

Client Version: v1.30.2
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.28.5

• Kubernetes installer & version: aks
• Cloud provider or hardware configuration: Standard_D16ds_v5
• OS (e.g. from /etc/os-release): ubuntu

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