clusterctl test framework: Restore CNIManifestPath to struct for API compat

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Parity with Cluster API 0.3.8

Signed-off-by: Naadir Jeewa jeewan@vmware.com

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #3607

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/test pull-cluster-api-test

[wfernandes]

/assign @sedefsavas

[sedefsavas]

cc @fabriziopandini

[sedefsavas]

/lgtm

[fabriziopandini]

/approve
to restoring the possibility to specify a CMI manifest path without using CRS.

@sedefsavas, should kubernetes-sigs/cluster-api-provider-aws#1816 switch CAPA to use CRS (so this field won't be used anymore)?

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[randomvariable]

/test pull-cluster-api-test

[sedefsavas]

@fabriziopandini Yes after that PR is in, it will be the case for CAPA but this PR is fine too to revert an undocumented breaking change, in the next release we can document and do this change.

@sedefsavas, should kubernetes-sigs/cluster-api-provider-aws#1816 switch CAPA to use CRS (so this field won't be used anymore)?

[vincepri]

/milestone v0.3.10