Do not patch felixconfig or bgpconfig when cluster routing mode is not set

[mazdakn]

Description

When clusterRoutingMode in the installation resource is not set, Operator should not patch FelixConfig or BGPConfig. This allows users to set programClusterRoutes in FelixConfig and BGPConfig without setting clusterRoutingMode in the installation resource.

Pick of #4667
Fixes: https://tigera.atlassian.net/browse/CORE-12626
Related to #4511

Release Note

TBD

For PR author

• Tests for change.
• If changing pkg/apis/, run make gen-files
• If changing versions, run make gen-versions

For PR reviewers

A note for code reviewers - all pull requests must have the following:

• Milestone set according to targeted release.
• Appropriate labels:
  • kind/bug if this is a bugfix.
  • kind/enhancement if this is a a new feature.
  • enterprise if this PR applies to Calico Enterprise only.